Pizza dough (a little bigger than a baseball for a 12 inch pizza). Most grocery stores carry pre-made pizza dough, look for it in the bakery department.
1/4 to 1/2 cup of marinara sauce depending on how saucy you like it.
1 cup of mozzarella cheese (add other cheeses if you want!).
A few tablespoons of all purpose flour so things don’t stick.
2 cloves garlic
6 to 10 basil leaves from the garden
2 thin slices of a large onion
4 thin slices of a ripe fresh tomato (hopefully home grown)
2 large white mushrooms, sliced
1 tablespoon olive oil
salt and pepper