Preheat oven to 450°.
Drop garlic through food chute with food processor on; process until minced. Add basil and next 6 ingredients (basil through bell peppers), and process until smooth, scraping sides of bowl once.
Place pizza crust on a baking sheet. Spread pepper mixture over pizza crust, leaving a 1/2-inch border; sprinkle with mozzarella. Arrange the tomato slices in a single layer on top of the cheese. Bake at 450° for 10 minutes. Sprinkle pizza with oregano.