Keto Big Mac Smash Burgers: Easy Low-Carb Recipe

Featured in Healthy Bites.

Craving a Big Mac on keto? Enjoy these easy low-carb smash burgers with a special sauce. Quick to make and packed with classic flavor, guilt-free.
Seraphina Quinn - Recipe Author
Updated on April 23, 2026 at 12:31 AM
Prep Time: 15 min Cook Time: 10 min Total Time: 25 min 4 Servings Beginner
Keto Big Mac Smash Burgers: Easy Low-Carb Recipe - Featured Image Pin it
Keto Big Mac Smash Burgers: Easy Low-Carb Recipe | Recipes by HomeChef

I remember those days, hon, when a Big Mac craving hit hard, and I just knew it wasn't going to fit my low-carb lifestyle. My heart would sink! Then, one glorious afternoon, after a particularly disappointing takeout attempt, I thought, 'What if I just... made it myself, but keto?' That spark ignited something, and after a few kitchen experiments (and a few burnt patties, oops!), the Keto Big Mac Smash Burgers were born. It's been a game-changer ever since, a little slice of fast-food heaven right in my own kitchen.

Oh, the first time I tried to smash these burgers, I got a little too enthusiastic. I grabbed a heavy pan and, well, let's just say half the patty ended up launching itself off the skillet and onto the floor! My dog, bless his heart, thought it was an unexpected treat. I didn't expect that! Now I know to use a sturdy spatula and gentle but firm pressure. Live and learn, right?

Ingredients for Your Next Keto Big Mac Smash Burgers

  • 1 1/2 lbs 80/20 ground beef: This is your foundation, hon! Don't skimp on the fat content here. That 80/20 ratio is crucial for getting that juicy, flavorful patty that makes these Keto Big Mac Smash Burgers so irresistible. Leaner beef just won't give you the same glorious sizzle or that rich, satisfying taste. Trust me, I've tried. It's the fat that renders down, creating those crispy edges we all crave. You want that classic burger experience, this is where it starts.
  • 1 tsp kosher salt: Salt isn't just for flavor, it's a flavor enhancer. Kosher salt, with its larger flakes, distributes so nicely over the beef. It pulls out that natural beefy taste, making every bite sing. I remember once I used table salt by mistake, and it was just... too much, too fast. Kosher salt gives you more control and a better overall seasoning for your patties.
  • 1/2 tsp black pepper: Freshly cracked black pepper, oh yes! It adds a subtle warmth and a little kick that really complements the beef. Don't underestimate the power of good pepper. It brings out another layer of flavor that just makes everything pop. It's a small detail, but it makes a big difference in the overall taste profile of your burger.
  • 1/2 cup full-fat mayonnaise: The mayo is the backbone of our secret sauce. Full-fat is key for that creamy, luscious texture that coats your tongue just right. Don't even think about light mayo here, friend. We're going for rich, decadent flavor, and the full-fat stuff delivers. It’s the perfect canvas for all those other vibrant flavors to shine, making our sauce for the Keto Big Mac Smash Burgers truly special.
  • 2 tbsp sugar-free ketchup: This is where we get that signature tang and sweetness without the sugar overload. Sugar-free ketchup has come a long way, and it blends seamlessly into our secret sauce. It provides that familiar Big Mac-esque acidity that balances the richness of the mayo and the beef. It's a small but mighty player in this flavor symphony.
  • 1 tbsp sugar-free dill pickle relish: Pickle relish? Oh yeah, it’s a non-negotiable! That little bit of briny crunch and tangy sweetness is what makes the secret sauce. It's that subtle pop of flavor that screams 'Big Mac' to your taste buds. I've tried chopping fresh pickles, but the relish just blends better and gives a more consistent flavor throughout. Don't skip it!

Making Keto Big Mac Smash Burgers: Step-by-Step Guide

Step 1: Make Secret Sauce:
Alright, let's kick things off with the star of the show that glorious secret sauce! Grab a small bowl, hon, and just toss in your mayo, sugar-free ketchup, relish, mustard, vinegar, onion powder, and garlic powder. Whisk it all together until it's super smooth and creamy. Taste it! Adjust if you need a little more tang or spice. This sauce is what ties the whole experience together, so don't rush it. Pop it in the fridge while you do the rest, letting the flavors meld is a game-changer!
Step 2: Prep Beef Patties:
Next up, the beef! Divide your ground beef into eight equal balls, about 2-3 ounces each. Don't press them or form them too much, we want them loose for that perfect smash. Season them generously with salt and pepper on both sides. This prep is super important for getting that amazing crust on your Keto Big Mac Smash Burgers. I usually do this on a sheet of parchment paper, it makes cleanup a breeze and keeps things neat. These little beefy nuggets are about to transform!
Step 3: Heat Skillet & Smash:
Now for the fun part! Get your cast iron skillet or heavy-bottomed pan screaming hot over medium-high heat. A little smoke is a good sign! Place two beef balls in the hot pan, leaving some space. Immediately, take a sturdy metal spatula (or a burger press!) and firmly smash each ball down into a thin patty, about 1/4 inch thick. Hold it for 10-15 seconds to ensure maximum contact with the hot surface. This is where the magic of these Keto Big Mac Smash Burgers really happens, creating those crispy, lacy edges.
Step 4: Cook & Add Cheese:
Let those beauties cook for about 2 minutes on the first side you're looking for a deep, golden-brown crust. Seriously, don't peek too early! Flip them over, and immediately place a slice of cheese on each patty. Let them cook for another 1-2 minutes until the cheese is beautifully melted and gooey. You want that perfect melt for our Keto Big Mac Smash Burgers, it's essential! Transfer them to a plate and repeat with the remaining beef, working in batches to avoid overcrowding the pan.
Step 5: Assemble Burger Bases:
Okay, time to build! If you're using low-carb buns, toast 'em up lightly. Otherwise, grab your lettuce wraps or burger bases. I like using a big, crisp lettuce leaf, like iceberg, as my 'bun.' Start with your chosen base, then layer on some chopped onion, pickles, and a cooked patty with its melted cheese. This is the structural integrity of your delicious creation, so stack carefully! We're almost ready to enjoy these amazing low-carb wonders.
Step 6: Drizzle & Serve:
The grand finale! Take your glorious secret sauce and generously drizzle it over your assembled burger bases. Don't be shy here, hon, that sauce is everything! Top with the second cheesy patty, and if you're feeling extra fancy, a few more pickle slices and a sprinkle of sesame seeds (if you're using a bun that allows for it). Serve these Keto Big Mac Smash Burgers immediately, while they're hot and juicy. Get ready for a flavor explosion!

Honestly, cooking these burgers feels like a little kitchen dance. There's something so satisfying about the sizzle when the beef hits the hot pan, that distinct smash sound, and then watching those edges get perfectly crispy. It's a quick, high-energy cooking experience that always leaves me feeling like a burger boss. Plus, the smell that fills the kitchen? Oh my goodness, it's heavenly!

Keeping Your Keto Big Mac Smash Burgers Fresh: Storage Secrets

Okay, so you've got leftovers a rare occurrence with these, I know! If you do, store the patties and the secret sauce separately. Those crispy patties can get a little sad and soft if they sit in sauce or get too moist. Pop the cooled patties into an airtight container in the fridge for up to 3 days. The sauce, in its own sealed jar, will last a good week. When reheating, I always recommend a dry skillet for the patties to try and crisp them up again. I once tried microwaving them, and oops, they turned into rubbery hockey pucks. Learn from my mistakes, friend! You want to preserve the deliciousness of your Keto Big Mac Smash Burgers for round two.

Keto Big Mac Smash Burgers: Easy Low-Carb Recipe - Image 1Pin it
Keto Big Mac Smash Burgers: Easy Low-Carb Recipe - Image 1 | Recipes by HomeChef

Swapping Ingredients for Keto Big Mac Smash Burgers

I've played around with substitutions quite a bit, honestly, just to see what works! If 80/20 beef isn't available, you can use 85/15, but you might want to add a tiny bit of bacon fat or butter to the pan for that extra sizzle. For the cheese, American slices are classic, but cheddar or provolone melt beautifully too. And if you're out of sugar-free relish, just finely mince some dill pickles that works in a pinch! For the bun, besides lettuce wraps, I've had success with portobello mushroom caps or even chaffles. It's all about making it work for you and your pantry.

What to Serve with Keto Big Mac Smash Burgers

Oh, the possibilities! You've got these incredible Keto Big Mac Smash Burgers, now what? For a classic low-carb side, I love serving them with a big, crisp green salad with a simple vinaigrette it cuts through the richness beautifully. Or, if I'm feeling a bit more adventurous, some air-fried radishes (they taste surprisingly like potatoes!) or roasted asparagus are fantastic. Sometimes, I'll even whip up a batch of my low-carb 'fries' using jicama or rutabaga. Don't forget extra pickles on the side, and maybe a little bowl of that secret sauce for dipping. Pure bliss, hon!

The Story Behind Keto Big Mac Smash Burgers

The Big Mac, in its original form, is an icon of American fast food, first introduced in 1967. It was designed to be a substantial, layered burger, and its 'special sauce' quickly became legendary. For us low-carb folks, recreating those classic flavors without the bun and sugary sauce has become a passion project. It's not just about making a burger, it's about reclaiming a beloved comfort food, making it accessible and guilt-free for our lifestyle. It’s a testament to how creative you can get in the kitchen, taking something familiar and making it yours.

And there you have it, friend! Your very own Keto Big Mac Smash Burgers, ready to conquer those cravings and impress your taste buds. This recipe isn't just food, it's a little piece of comfort, reimagined. I hope you love making and eating them as much as I do. Don't forget to tag me on social media when you whip up your batch I love seeing your kitchen triumphs!

Keto Big Mac Smash Burgers: Easy Low-Carb Recipe - Image 2Pin it
Keto Big Mac Smash Burgers: Easy Low-Carb Recipe - Image 2 | Recipes by HomeChef

FAQs About Keto Big Mac Smash Burgers

Can I make the secret sauce ahead of time?

Oh, absolutely! In fact, I highly recommend it. Making it a day or even a few hours in advance lets all those amazing flavors really meld together. Just store it in an airtight container in the fridge, and it'll be good for about a week. It's a fantastic meal prep hack!

What kind of cheese works best?

American cheese slices are the classic choice because they melt so beautifully and have that iconic flavor. But honestly, I've used sharp cheddar, provolone, and even a Monterey Jack, and they all work great! Pick your favorite melty cheese, hon, you can't go wrong.

My patties aren't getting crispy, what am I doing wrong?

Aha! This is usually about pan temperature. You need that skillet screaming hot, like, almost smoking. And don't crowd the pan! Cook just two patties at a time to maintain that high heat. That's the key to those irresistible crispy edges.

Can I use leaner ground beef?

You can, but I don't really recommend it for smash burgers. That 80/20 fat content is crucial for getting juicy, flavorful patties and those crispy edges. Leaner beef tends to dry out and doesn't get that same satisfying sear. If you must, add a bit of oil or bacon fat to the pan.

How many servings does this recipe make?

This recipe is designed to make four delicious servings, each with two cheesy smash patties. It's perfect for a family dinner or if you want some leftovers for lunch the next day. Sometimes I scale it up for guests, but four is usually my sweet spot!

Keto Big Mac Smash Burgers: Easy Low-Carb Recipe

Craving a Big Mac on keto? Enjoy these easy low-carb smash burgers with a special sauce. Quick to make and packed with classic flavor, guilt-free.

4 out of 5
(48 reviews)
Prep Time
15 Minutes
Cook Time
10 Minutes
Total Time
25 Minutes

Category: Healthy Bites

Difficulty: Beginner

Cuisine: American

Yield: 4 Servings

Dietary: Diabetic-Friendly, Gluten-Free

Published: April 23, 2026 at 12:30 AM

Ingredients

→ The Smashed Beef Foundation

01 1 1/2 lbs 80/20 ground beef
02 1 tsp kosher salt
03 1/2 tsp black pepper

→ Secret Sauce (Keto Edition)

04 1/2 cup full-fat mayonnaise
05 2 tbsp sugar-free ketchup
06 1 tbsp sugar-free dill pickle relish
07 1 tbsp yellow mustard
08 1 tsp white vinegar
09 1/2 tsp onion powder
10 1/4 tsp garlic powder
11 1/4 tsp smoked paprika

→ Classic Big Mac Fixings

12 4 slices American cheese
13 2 cups shredded iceberg lettuce
14 1/2 cup dill pickle slices (sugar-free)
15 1/4 cup finely diced white onion

Instructions

Step 01

Combine 1/2 cup full-fat mayonnaise, 2 tbsp sugar-free ketchup, 1 tbsp sugar-free dill pickle relish, 1 tbsp yellow mustard, 1 tsp white vinegar, 1/2 tsp onion powder, 1/4 tsp garlic powder, and 1/4 tsp smoked paprika in a small bowl. Whisk until smooth. This secret sauce is key for your Keto Big Mac Smash Burgers: Easy Low-Carb Recipe.

Step 02

Divide 1 1/2 lbs 80/20 ground beef into 8 equal portions, forming loose balls. Season each portion with 1 tsp kosher salt and 1/2 tsp black pepper. Do not press or flatten them yet, they will be smashed directly on the hot cooking surface.

Step 03

Heat a large cast-iron skillet or griddle over high heat until smoking. Place two seasoned beef balls onto the hot surface. Immediately smash each ball flat with a sturdy spatula, pressing firmly for 10-15 seconds, creating thin patties.

Step 04

Cook the smashed patties for 2-3 minutes until a deep brown crust forms. Flip them, then immediately place 1 slice American cheese on each patty. Cook for another 1-2 minutes until the cheese is melted and the burgers are cooked through. Repeat with remaining beef.

Step 05

For each Keto Big Mac Smash Burgers: Easy Low-Carb Recipe, stack two cheesy patties. Top with a generous amount of 2 cups shredded iceberg lettuce, 1/2 cup dill pickle slices (sugar-free), and 1/4 cup finely diced white onion.

Step 06

Drizzle a generous amount of the prepared Secret Sauce over the assembled burgers. Serve immediately. Enjoy your delicious and easy Keto Big Mac Smash Burgers: Easy Low-Carb Recipe, a perfect low-carb alternative to the classic.

Notes

  1. For an extra crispy crust on your smash burgers, ensure your skillet is screaming hot before adding the beef. Using a piece of parchment paper between the beef ball and your spatula can prevent sticking when smashing.
  2. To make this recipe even faster, prepare the Secret Sauce and chop your toppings (lettuce, pickles, onion) ahead of time. Store them in the refrigerator until ready to assemble.
  3. If you miss the "bun," consider serving these smash burgers on large lettuce wraps, keto-friendly buns, or even between two grilled portobello mushroom caps for a heartier option.
  4. Pair your Keto Big Mac Smash Burgers with a side of loaded cauliflower mash, air-fried radishes, or a simple green salad for a complete and satisfying low-carb meal.

Tools You'll Need

  • Large cast-iron skillet
  • Sturdy spatula
  • Mixing bowl
  • Measuring cups and spoons
  • Sharp knife
  • Cutting board

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Dairy
  • Eggs

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 754 kcal
  • Total Fat: 62 g
  • Total Carbohydrate: 4 g
  • Protein: 36 g

Reviews & Comments

Required fields are marked *

Keto Big Mac Smash Burgers: Easy Low-Carb Recipe

📌 Save Before You Go!

Don't lose this recipe — save it to Pinterest!

Save on Pinterest
Keto Big Mac Smash Burgers: Easy Low-Carb Recipe

Don't Lose This Recipe!

Save it now — you'll want to make this again!