Heat a skillet on medium heat. Spray with non stick cooking spray.
Fold a tortilla in half and place shredded mozzarella on half of the inside of the tortilla. Top with sliced pepperoni, sliced onions, and sprinkle on a small amount of the oregano. Place folded tortilla into the pan and cook 3-4 minutes on each side until cheese is melted. Remove and set aside.
Spray the pan again and repeat step 2 until all tortillas are filled and cooked.
Warm pizza sauce sauce on the stove top then serve on the side for dipping.