As I mentioned to the students, cooking is an art so have fun with it and get creative. If you are missing an ingredient look in your kitchen and you'll find something that will work just as good, for instance, if you don't have or like yellow squash maybe you have an eggplant instead or if you don't have fresh rosemary use oregano. This may look like a lot of ingredients and steps but it should only take you about 20 minutes of prep time and 40-45 minutes baking time and it is well worth it!! Have a Pizza making party with all your friends... Tons of fun guaranteed!