Heat a non-stick griddle or skillet over medium heat. Take one tortilla and sprinkle 1/4 cup cheese on one side. Top with desired toppings. Sprinkle a little more cheese over toppings. Fold over other half of tortilla to cover toppings. Carefully place on heated griddle. Cook tortilla on each side for about a minute, or until cheese is melted. Transfer pizzadilla to a plate. Repeat with remaining tortillas and toppings.