Place flatbread on a baking tray. Baked for 2 minutes**. Remove from oven. Leave the oven on.
Spread 3 tablespoons of red sauce on each slice to flatbread. Arrange half the pepperoni, onion, and yellow pepper on each of the flatbread.
Sprinkle shredded cheese and parmesan over the vegetables. Then arrange basil leaves on the top.
Return flatbread to the oven. Bake for 8 to 10 minutes**.
Notes
** Baking times given in this recipe are based on the type of flatbread I am using. Please follow the packaging instructions if you are using a different kind of flatbread.