Cheesy Zucchini Squash Casserole Recipe

Featured in Perfect Sides.

Make this delicious cheesy zucchini squash casserole, perfect as a side dish or hearty main with fresh ingredients and creamy flavors everyone will love!
Casey - Recipe Author
Updated on Fri Jan 09 2026 at 08:35 AM
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Cheesy Zucchini Squash Casserole Recipe | Recipes by HomeChef

Okay, so this cheesy zucchini squash casserole? It's kind of a big deal. Honestly, it all started with my Grandma Rose. Every Thanksgiving, her kitchen smelled like a magical blend of nutmeg, garlic, and melting cheese pure comfort in a casserole dish. I remember sneaking tastes as she stirred, the warm cheesy goodness clinging to the spoon. To be real, I wasn't always a zucchini fan (texture issues, you know?), but her casserole? It was different. It was love. This recipe is my attempt to recreate that magic, with a few of my own happy (and sometimes disastrous!) kitchen moments thrown in.

Why You'll Love This Recipe

  • It's surprisingly easy! (Okay, maybe not always easy, but mostly!)
  • Great for picky eaters and perfect for leftovers (if there are any!)
  • Comfort food appeal that just makes you feel hugged
  • Perfect for date nights or cozy nights in
  • Meal-prep win when you need it most
  • Has that emotional appeal that hits different

One time, I tried to get fancy and added caramelized onions. Oops. They burned. Let's just say I stuck to the basics after that. Lesson learned! But honestly, the simple version is the best.

Ingredients

  • zucchini and Yellow Squash (about 3 lbs): I swear by those beautiful, dark green zucchinis. They're just more flavorful! And don't even get me started on how much I love fresh over frozen.
  • Onion (1 large): I always use a Vidalia so sweet! But any yellow onion will do. You could even add some leeks for extra flavor. I tried it once, and it was… kinda interesting. A bit earthy, you know?
  • Garlic (4 cloves): Honestly, I'm a garlic fiend. More is always better in my book. Fresh garlic, of course. Don't even think about using powder.
  • Eggs (2 large): These bind everything together. I've tried using flax eggs, but I'm still on team chicken eggs.
  • Cheddar Cheese (2 cups, shredded): Sharp cheddar is my go-to, but a blend with Monterey Jack is delicious too. This is where the cheesy magic happens.
  • Milk (1 cup): Don't use skim milk, just don't. Whole milk adds richness and creaminess that you won't regret.
  • Breadcrumbs (1/2 cup): Adds a nice crunchy topping. I like panko, but regular breadcrumbs work fine.
  • Seasonings & Spices: Salt, pepper, garlic powder, onion powder, dried thyme, and a pinch of nutmeg. Trust me on the nutmeg. It's the secret ingredient!

Instructions

Step 1: Prep the veggies:
First, wash and chop the squash and onion. I usually grate the squash, but slicing it works too. Honestly, I've done it both ways a million times. It's whatever you're in the mood for.
Step 2: Sauté the aromatics:
Sauté the onions and garlic in a large skillet until softened. This step takes about 5-7 minutes. This is where the beautiful aromas start to fill the kitchen. Pure magic!
Step 3: Combine ingredients:
In a large bowl, combine the sautéed veggies, grated squash, eggs, cheese, milk, breadcrumbs, and seasonings. Mix it all up! This is where I always forget to salt the water…oops!
Step 4: Pour into casserole dish:
Pour the mixture into a greased 9x13 inch casserole dish. Spread it evenly. It's usually pretty thick at this point, which is good.
Step 5: Bake:
Bake at 375°F (190°C) for 45-50 minutes, or until golden brown and bubbly. Keep an eye on it, as ovens vary.
Step 6: Rest and serve:
Let it rest for about 10 minutes before serving. This helps it set up nicely. And honestly, it's so much better slightly cooled anyway.

You must Know

  • Don't overbake! It can get dry.
  • Make sure your squash is well drained before adding it to the mixture. Otherwise, it'll be watery.
  • Taste and adjust seasonings as needed.

I remember one time, I completely forgot to add the cheese. I was so upset! It was still good, but obviously, not as good as the cheesy version. Live and learn, right?

Storage Tips

Leftovers can be stored in an airtight container in the fridge for up to 3 days. I've even frozen it before just make sure to thaw it completely before reheating. I microwaved it once and the sauce separated so don't do that lol. Reheat gently in the oven or on the stovetop for best results.

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Cheesy Zucchini Squash Casserole Recipe - Image 1 | Recipes by HomeChef

Ingredient Substitutions

You can use different types of squash, like butternut squash. I tried it once and it worked… kinda. It was sweeter. You could also use different cheeses a Mexican blend would be fun! Or even some Gruyere for something fancier.

Serving Suggestions

This casserole is great on its own, but it also pairs well with a simple salad or some roasted vegetables. This dish and a rom-com? Yes please. A side of crusty bread is perfect for sopping up the extra cheesy goodness.

Cultural Backstory

This recipe isn't tied to a specific culture, but it's a classic comfort food that evokes feelings of warmth and family. For me, it's deeply connected to my grandma and those Thanksgiving memories. It's a taste of home, wherever I am.

This casserole is more than just a recipe; it's a hug in a bowl. It's a reminder of simpler times and the warmth of family. I hope you enjoy making it as much as I do! Let me know how yours turns out!

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Cheesy Zucchini Squash Casserole Recipe - Image 2 | Recipes by HomeChef

Frequently Asked Questions

→ Can I make this ahead of time?

Absolutely! You can assemble the casserole a day ahead and bake it when you're ready. Just cover it and refrigerate it.

→ What if I don't have breadcrumbs?

You can use crushed crackers or even some shredded cheese in place of breadcrumbs. It won't be quite the same texture, but it'll still be tasty!

→ How do I know when it's done?

It's done when it's golden brown on top and bubbly. A knife inserted into the center should come out clean.

→ How long does it last?

Leftovers will last in the fridge for 3-4 days. Reheat gently!

→ Can I add other vegetables?

Sure! Mushrooms, bell peppers, or even spinach would be great additions.

Cheesy Zucchini Squash Casserole Recipe

Make this delicious cheesy zucchini squash casserole, perfect as a side dish or hearty main with fresh ingredients and creamy flavors everyone will love!

4.4 out of 5
(37 reviews)
Prep Time
20 Minutes
Cook Time
50 Minutes
Total Time
70 Minutes
By: Casey

Category: Perfect Sides

Difficulty: Beginner

Cuisine: American

Yield: 6 Servings

Dietary: Vegetarian

Published: Tue Jul 08 2025 at 11:57 PM

Last Updated: Fri Jan 09 2026 at 08:35 AM

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Ingredients

→ Main Ingredients

01 Zucchini and Yellow Squash (about 3 lbs)
02 Onion (1 large)
03 Garlic (4 cloves)
04 Cheddar Cheese (2 cups, shredded)

→ Seasonings & Spices

05 Salt
06 Pepper
07 Garlic Powder
08 Onion Powder
09 Dried Thyme
10 Nutmeg

→ Binding & Creamy Elements

11 Eggs (2 large)
12 Milk (1 cup)

→ Topping

13 Breadcrumbs (1/2 cup)

Instructions

Step 01

Wash and chop the squash and onion. I usually grate the squash, but slicing it works too. Honestly, I've done it both ways a million times. It's whatever you're in the mood for.

Step 02

Sauté the onions and garlic in a large skillet until softened. This step takes about 5-7 minutes. This is where the beautiful aromas start to fill the kitchen. Pure magic!

Step 03

In a large bowl, combine the sautéed veggies, grated squash, eggs, cheese, milk, breadcrumbs, and seasonings. Mix it all up! This is where I always forget to salt the water…oops!

Step 04

Pour the mixture into a greased 9x13 inch casserole dish. Spread it evenly. It's usually pretty thick at this point, which is good.

Step 05

Bake at 375°F (190°C) for 45-50 minutes, or until golden brown and bubbly. Keep an eye on it, as ovens vary.

Step 06

Let it rest for about 10 minutes before serving. This helps it set up nicely. And honestly, it's so much better slightly cooled anyway.

Notes

  1. Don't overbake! It can get dry.
  2. Make sure your squash is well drained before adding it to the mixture. Otherwise, it'll be watery.
  3. Taste and adjust seasonings as needed.
  4. Adding a sprinkle of parmesan cheese on top before baking adds extra flavor and a nice crispy topping.

Tools You'll Need

  • Large skillet
  • large bowl
  • 9x13 inch casserole dish

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: 300 calories
  • Total Fat: 15 grams
  • Total Carbohydrate: 25 grams
  • Protein: 10 grams

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