Name: Cheesy Squash Casserole
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Ingredients: 2 tablespoons butter (unsalted); 1 ½ pounds yellow summer squash (7 ½ cups sliced about ¼ inch thick); 2 cups chopped sweet onion; 1 teaspoon salt (more or less, to taste); ½ teaspoon black pepper (more or less, to taste); ½ cup sour cream; ½ cup grated Parmesan cheese; 1 ½ cups shredded sharp cheddar cheese; 1 sleeve round buttery crackers (crushed (Ritz))

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This Cheesy Squash Casserole with a crunchy buttery cracker topping is the ultimate comfort food side dish. It’s perfect for summer cookouts, potlucks and holiday feasts!

Cheesy squash casserole on a white plate with a baking dish in the background.

This is by far one of my very favorite side dishes (I’ve been known to eat a bowl for breakfast!). It’s prepared with yellow summer squash, but I enjoy it year-round. It’s a staple at our annual holiday gathering and pairs with just about any main course.

Squash Casserole Ingredients Notes

Overhead view of squash casserole ingredients on a marble surface.

Yellow summer squash – you’ll need approximately 1 1/2 pounds to yield 7 1/2 cups of sliced squash needed for this recipe. I like to use small to medium squash since they have smaller seeds.
Cheddar cheese – be sure to shred the cheese from a block and don’t use bagged pre-shredded cheese (it doesn’t melt as well).
Round buttery crackers – such as Ritz.
Parmesan cheese – I’ve always used the Parmesan cheese in the shaker in this recipe.
Sweet onion – I’ve also made this casserole with chopped yellow onion and it’s just as delicious!

How to Make it

Following is a brief overview of how to prepare – please see the recipe card at the end of this post for full detailed instructions.

A photo collage showing steps of how to make yellow squash casserole.

Melt butter in a large skillet and cook the squash and onions until tender.
Drain off juices in a colander.
Stir together squash, onions, salt, pepper, sour cream and cheeses in a large bowl.

A photo collage showing how to make cheesy squash casserole.

Spread the squash mixture in a baking dish that has been sprayed with cooking spray.
Sprinkle evenly with crushed buttery crackers. Bake for 15 to 20 minutes, or until crackers are golden brown and edges of casserole are bubbly.

Front view of squash casserole in a white baking dish with a spoon.

Make-Ahead Instructions

Prepare casserole as directed before baking but do not top with crushed crackers. Cover and refrigerate the casserole until it’s ready to be baked. Remove from the fridge and allow to come close to room temperature. Sprinkle with crackers just before baking.

Enjoy!

More Comforting Side Dishes

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