01 -
Wash and chop the yellow squash into half-inch thick slices. Sauté the chopped onion in butter until translucent.
02 -
Add flour to the sautéed onions and butter, stirring constantly to create a roux. Gradually whisk in the milk until smooth.
03 -
Stir in the cheese until melted and smooth. Season with salt and pepper. Add the chopped squash to the cheese sauce.
04 -
Pour the mixture into a greased casserole dish. Sprinkle breadcrumbs on top. Bake at 375°F (190°C) for 30-40 minutes, or until golden brown and bubbly.
05 -
Let the casserole cool for a few minutes before serving.
06 -
Serve warm and enjoy your delicious cheesy yellow squash casserole!