You can add any of your own favorite pizza toppings such as sun-dried tomatoes, sliced black olives, or red peppers cut into small pieces. Any vegan cheese can work here whether it's fresh mozzarella cheese, parmesan cheese, or cheddar cheese.    As a meat eater, you can add sausage, ham or bacon. Before adding to the oven, you can sprinkle a little Italian seasoning or red pepper flakes if you want to add a little heat.