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This easy zucchini tomato casserole is packed with the fabulous flavor of summer vegetables in a simple yet comforting side to serve with any meal.
Gather all ingredients. Preheat the oven to 375 degrees F (190 degrees C). Lightly butter a 9-inch square pan.
Combine Cheddar, Parmesan, garlic, oregano, and basil in a large bowl. Season with salt and pepper to taste; set aside.
Arrange 1/2 of the zucchini slices in the prepared pan. Sprinkle 1/4 of the cheese and herb mixture on top.
Arrange 1/2 of the tomatoes and top with another 1/4 of the cheese mixture. Repeat layers.
Melt butter in a skillet over medium heat. Add onions; cook and stir until soft and translucent. Stir in bread crumbs; cook until they have absorbed the butter.
Sprinkle on top of casserole.
Cover loosely with foil and bake in the preheated oven for 25 minutes. Remove foil and bake until the top is crusty and vegetables are tender, about 20 minutes.
Serve and enjoy!