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Yellow Squash Casserole

This creamy, cheesy Yellow Squash Casserole with a buttery cracker crumb topping is an easy and delicious way to enjoy your summer squash. It's a classic Southern side dish that is sure to become a favorite!
Prep Time10 mins
Cook Time30 mins
Total Time40 mins
Course: Side Dish
Cuisine: American
Servings: 6
Calories: 337kcal
Author: Michelle / Now Cook This!


  • cooking spray
  • 1 tablespoon olive oil
  • 3 tablespoons butter, divided
  • 2 pounds yellow squash, cut into quarter-moons (about 6 cups)
  • salt and pepper, to taste
  • 1 cup chopped onion
  • 1 clove garlic, minced
  • 1 cup shredded cheddar cheese
  • ½ cup grated Parmesan cheese
  • ½ cup sour cream
  • 1 sleeve buttery crackers (I use Ritz) (about 30 crackers), crushed, divided


  • Preheat the oven to 350°F. Spray a 1½ to 2-quart baking dish with cooking spray.
  • In a large pan, heat the olive oil and 1 tablespoon of the butter over medium heat. When the butter is melted, add the yellow squash and onions, lightly season with salt and pepper, and sauté until they are crisp-tender, about 10 minutes. Note: To avoid a mushy casserole, be sure not to overcook the squash at this point. They will continue cooking in the oven.
  • Add the garlic and saute for another minute.
  • Remove from the heat and add the cheddar cheese, Parmesan cheese, sour cream, and half of the crushed crackers. Stir until well combined. Taste and adjust seasoning if needed.
  • Pour into the prepared baking dish.
  • Melt the remaining 2 tablespoons of butter and add to the remaining crushed crackers; stir to combine, making sure all of the cracker crumbs are coated in butter.
  • Sprinkle the butter/crushed cracker mixture over the top of the squash mixture.
  • Bake for 20 minutes or until the casserole is bubbly and the cracker topping is golden brown.

Recipe Notes

  • You can also make this casserole with zucchini or a combination of yellow squash and zucchini. 
  • This casserole would also be good with other melty cheeses like Gruyère or Monterey Jack. Use your favorite!