In a medium bowl, add the diced onion, sweet corn, bell peppers, chili flakes, pizza seasoning, salt, and grated mozzarella. Mix everything together until well combined.
Take a semi-cooked tortilla and cut it in half. Place a spoonful of the filling on one half and shape it into a triangle. Fold one side over the filling, then fold the other side over it to make a triangle. Repeat with the remaining tortillas and filling.
Heat a pan over medium heat and lightly grease it with butter. Place the wraps seam-side down and cook until golden and crisp. Lightly butter the top, then carefully flip and cook the other side until golden brown and the cheese has melted.
Transfer the wraps to a plate and serve them hot with a dipping sauce.