Brush a cookie sheet with oil. Lay tomatoes sliced 3/8-1/2" thick on the cookie sheet. Brush with olive oil and dust with garlic powder and bake about 1/2 hr at 350 deg. until they start to dry out a little. When the pizza crusts are ready, carefully move the tomato slices with a pancake flipper and arrange to nearly cover the pizza. Sprinkle a small amount of grated mozzarella on top and then top with vegetables sauteed slightly in olive oil with garlic (suggestions: peppers, zucchini, mushrooms, and onions). One can also add a little blue or gorgonzola cheese to the vegies.