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Italian Zucchini Casserole: Perfect for Any Occasion

Italian Zucchini Casserole is a delicious and easy-to-make side dish that combines thinly sliced zucchini, tomatoes, and onions layered with cheese, herbs, and a garlicky breadcrumb topping. Baked until bubbly and golden, this casserole is perfect for using up summer zucchini and pairs wonderfully with grilled meats.
Prep Time 20 minutes
Cook Time 1 hour
Total Time 1 hour 20 minutes
Course Side Dish
Cuisine Italian
Servings 6
Calories 183 kcal

Ingredients
  

  • Medium zucchini save the small ones for other dishes, like spaghetti alla Nerano
  • Fresh tomatoes beefsteak, heirloom, or plum work beautifully
  • Onions yellow, white, or red—your choice!
  • Pecorino Romano cheese because everything’s better with cheese
  • Dried Sicilian oregano trust me, it makes a difference
  • Extra virgin olive oil

Instructions
 

  • Preheat your oven to 375°F.
  • Slice your zucchini, tomatoes, and onions thinly. Pat them dry with paper towels to avoid a soggy casserole.
    Slice your zucchini, tomatoes
  • Layer the veggies in a baking dish, sprinkling each layer with salt, pepper, oregano, and grated cheese.
  • Top it all off with a mix of breadcrumbs, garlic, olive oil, and more cheese.
  • Bake for 45 minutes, or until golden and bubbly. Broil for the last minute if you want extra crispiness.
    Bake for 45 minutes, or until golden and bubbly
  • Pro Tip: Let it rest for 10–15 minutes before serving. This gives the flavors time to meld and makes it easier to slice.

Notes

  • Layering: A large shallow baking dish with only 3 layers works better and cooks quicker than a deep dish with many layers.
  • Seasoning: Distribute seasoning evenly across each layer; adjust based on the number of layers.
  • Wetness: Pat dry the zucchini and tomatoes before layering to avoid excess liquid during baking. If the casserole is too wet after 45 minutes, drain some liquid or bake longer.
  • Browning: For more browning, broil for the last 1-2 minutes but watch carefully to prevent burning.
  • Make Ahead: Can be made ahead and reheated or served at room temperature. Leftovers keep for up to 3 days.
Keyword Baked Zucchini Recipe, Easy Zucchini Casserole, Italian Zucchini Casserole, Summer Side Dish, Vegetarian Casserole, Zucchini Onion Tomato Bake, Zucchini Tomato Casserole