Absolutely the Best Zucchini Casserole

2 or 3 zucchini, thinly sliced
2 large tomatoes, sliced
1 large sweet onion, sliced
2 cups shredded sharp Cheddar cheese
1 cup croutons (any flavor)

Spray a 9-inch square baking pan. Heat oven to 375 degrees F.

Layer zucchini, onion and tomato in prepared pan. Sprinkle with salt and pepper to taste and then add a layer of the cheese. Repeat layering but before adding the cheese, lay down a layer of croutons. Cover with foil and bake for about 40 minutes depending on how well done you like your vegetables. Remove the foil just before finished baking to brown the top a little.