Preheat oven to 425 degrees Fahrenheit. Chop onions and peppers. Saute with a drizzle of olive oil until tender.

Put cheese, pepperoni, and veggies in the middle of 2 tortillas. Spread with butter. Cook in hot skillet for 2-3 minutes on each side or until golden brown.

Spray baking sheet with non stick cooking spray. Top your cooked quesedilla with pizza sauce, more cheese, pepperoni, and veggies. Bake in oven for 5-7 minutes until the cheese is melted.