Zucchini Squash Casserole with Crispy Topping

Golden-brown zucch squash casserole 8 in cast iron skillet with crispy breadcrumb topping and fresh yellow squash beside it

5 from 5 reviews

Zucchini Squash Casserole with Crispy Topping

Squash Casserole is a classic Southern side dish that's pure perfection! Beautiful yellow squash is layered into a cast iron, topped with a crunchy, cheesy crust, and then drizzled with a light butter sauce to create an irresistibly flavorful dish everyone will love.

Prep Time10

Cook Time30

Total Time40

Course: Side Dish

Cuisine: American

Servings:

Calories: 305kcal

Author: Donya Mullins

Ingredients

2 tablespoons butter
4 - 5 cups squash - sliced
¼ cup mayonnaise
2 tablespoons milk
1 teaspoon salt
½ teaspoon pepper
¼ teaspoon garlic powder
⅓ cup Panko breadcrumbs
1 tablespoon butter
1 tablespoon olive oil
3 tablespoons Parmesan cheese

Instructions

Heat oven to 375 degrees. Place the cast iron skillet in the oven to heat. When it's come up to temp, take the skillet out of the oven and place 2 tablespoons of butter into the pan. Place the skillet back into the oven for 3 minutes or until butter melts.
Carefully place sliced squash in a buttered skillet. In a small bowl or cup, mix together mayonnaise and milk. Pour over squash. Sprinkle on salt, pepper, garlic powder, and 1 tablespoon of Parmesan cheese. Cover the skillet with tin foil and place in the oven. Cook for 20 minutes.
Melt butter in an oven proof dish. Add olive oil and Panko bread crumbs and mix. Set aside. Take the skillet out of the oven and remove foil. Sprinkle on buttered Panko crumbs and remaining Parmesan cheese. Place skillet back in oven, uncovered, and cook an additional 10 minutes until topping is golden brown.
Remove skillet from oven and let cool for 5 minutes before serving.

Notes

Recipe Variations:

Buttery Topping: Enhance the buttery flavor with crushed Ritz or Townhouse crackers.
Sharp Cheese: Create a more pronounced Southern flavor with sharp cheddar.
Sweet Onion: Add a touch of sweetness by sautéing a Vidalia onion.
Veggie Boost: Add sautéed garlic, bell peppers, or mushrooms for an extra layer of flavor.

Storing and Reheating:

Storing: Keep leftovers fresh for up to 4 days in an airtight container in the fridge.
Freezing: For best quality after thawing, follow make-ahead freezing directions.
Reheating: Reheat in oven/air fryer (350°F) to restore topping's crispness. Microwave if needed, but expect a softer topping.

Make Ahead: Assemble casserole (without topping) in skillet. Cover and refrigerate up to 24 hours. Top and bake as directed, adding 5-10 minutes to covered bake time.

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