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Easy Cheesy Zucchini Casserole

A cheesy zucchini casserole is a baked dish made with sliced or grated zucchini, cheese, eggs, and a few simple seasonings. It’s creamy in the center with a slightly crisp, golden crust on top. This casserole combines the mild sweetness of zucchini with the richness of melted cheese, creating a balanced and satisfying dish that pairs perfectly with meats, salads, or even pasta.

Ingredients

Scale
  •  medium zucchinis (about 5–6 cups), sliced or shredded

  • 1 small onion, finely chopped

  • 2 cups shredded cheddar cheese (divided)

  • ½ cup grated Parmesan cheese

  • 2 large eggs

  • ½ cup sour cream or Greek yogurt

  • ½ cup breadcrumbs or crushed crackers (for topping)

  • 2 tablespoons melted butter

  • ½ teaspoon salt

  • ¼ teaspoon black pepper

  • ½ teaspoon garlic powder

  • ½ teaspoon dried oregano or Italian seasoning

Instructions

Step 1: Preheat the oven

Preheat your oven to 375°F (190°C). Grease a 9×9-inch baking dish with butter or non-stick spray.

Step 2: Prepare the zucchini

If using sliced zucchini, place them in a colander, sprinkle lightly with salt, and let sit for 10–15 minutes to draw out excess moisture. Pat dry with paper towels before using.

Step 3: Make the creamy base

In a large bowl, whisk together eggs, sour cream, garlic powder, oregano, salt, and pepper until smooth. Add 1 ½ cups of cheddar cheese, Parmesan, and chopped onion. Stir to combine.

Step 4: Add the zucchini

Fold the zucchini into the mixture until evenly coated. Pour into the prepared baking dish and spread evenly.

Step 5: Add the topping

In a small bowl, mix breadcrumbs (or crushed crackers) with melted butter and the remaining ½ cup of cheddar cheese. Sprinkle evenly over the top.

Step 6: Bake until golden

Bake uncovered for 30–35 minutes, or until the casserole is bubbling and the top is golden brown.

Step 7: Cool and serve

Let the casserole rest for 5–10 minutes before slicing. Serve warm as a side or light main dish.