Preheat a large non-stick skillet to medium-high heat. Lightly butter a single side of one tortilla with about ½ a teaspoon of butter and place it in the hot pan. Sprinkle 3 tablespoons of cheese, ¼ cup of your favorite filling, and an additional 2-3 tablespoons of cheese on just one half of the open tortilla. Fold the tortilla over on itself and let it cook for 2-3 minutes.
When the cheese has begun to melt and the bottom tortilla is browning slightly, flip the folded quesadilla over to cook the other side. Continue to cook until all the cheese is melted and the tortilla is crisp around the edges.
Using a spatula, transfer the quesadilla back to a cutting board and cut into wedges while it is hot and serve warm. Repeat as desired. Enjoy!
Suggested quesadilla combinations: pulled pork, onions, and mozzarella cheese chopped chicken, peppers, and pepper jack cheese chopped baby spinach, thin mushrooms, chopped chicken, fontina thinly sliced apple, fontina, and cheddar cheese roasted broccoli and cheddar cheese thin sliced mushrooms, zucchini, and monterey jack cheese scrambled eggs, crumbled bacon or sausage, cheddar cheese roasted green chile, cheddar, pepper jack or monterey jack