Zucchini Tomato Casserole

1/4 cup butter
3 medium zucchini, sliced 1/8 inch thick
1/8 teaspoon garlic powder
4 medium tomatoes, sliced 1/4 inch thick
1 large onion, sliced 1/8 inch thick
1/2 pound fresh mushrooms, sliced 1/8 inch thick
1/2 cup mozzarella cheese, grated

Heat oven to 400 degrees F.

Saute zucchini in butter with a very light sprinkling of garlic powder. Layer zucchini, tomatoes, onions and mushrooms in a 2-quart casserole. Top with cheese. Bake 15 minutes.