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Squash Casserole Recipe

5 from 146 reviews

A comforting and classic Squash Casserole featuring tender yellow squash and zucchini cooked with onions, topped with a flavorful blend of seasoned breadcrumbs, Parmesan, and cheddar cheese, then baked to golden perfection.

Ingredients

Scale

Vegetables

  • 1 small onion, sliced
  • 2 pounds squash (yellow squash and zucchini), sliced into ¼-inch slices

Cooking Fats & Seasonings

  • 1 tablespoon butter
  • 1 tablespoon olive oil
  • ½ teaspoon Italian seasoning
  • Salt and pepper to taste

Toppings

  • ⅓ cup seasoned bread crumbs
  • ¼ cup grated Parmesan cheese
  • ¼ cup shredded cheddar cheese
  • 2 tablespoons melted butter

Instructions

  1. Preheat Oven: Preheat your oven to 350°F (175°C) to prepare for baking the casserole later.
  2. Slice Squash: Slice both yellow squash and zucchini into ¼-inch thick slices to ensure even cooking and tenderness.
  3. Sauté Onion and Squash: In a large skillet over medium heat, cook the sliced onion in butter and olive oil until tender. Then increase the heat to medium-high, add the sliced squash, Italian seasoning, salt, and pepper, and cook for 5 to 6 minutes until the squash is just tender-crisp.
  4. Arrange Squash in Baking Dish: Grease a 2-quart baking dish and arrange the cooked squash and onions so that the squash slices stand on their sides, creating an attractive layered casserole.
  5. Prepare Topping: In a small bowl, combine the seasoned breadcrumbs, grated Parmesan cheese, shredded cheddar cheese, and melted butter. Sprinkle this mixture evenly over the top of the arranged squash and onions.
  6. Bake the Casserole: Place the casserole in the preheated oven and bake for 35 to 40 minutes, or until the squash is tender and the topping is golden brown and bubbly.

Notes

  • Use a mix of yellow squash and zucchini for color and flavor variation.
  • For a crispier topping, broil for 1-2 minutes at the end of baking, watching carefully to avoid burning.
  • Seasoned breadcrumbs add extra flavor, but plain breadcrumbs with added herbs can be substituted.
  • This casserole pairs well with grilled meats or as a vegetarian main dish.
  • Leftovers can be refrigerated for up to 3 days and reheated in the oven for best texture.

Keywords: squash casserole, yellow squash, zucchini, baked casserole, side dish, vegetarian casserole