Gather ingredients: tortillas, shredded cheese, optional fillings (chicken, beef, beans, sautéed veggies, peppers, onions), optional salsa, optional sour cream, optional cilantro
Cook fillings if using: season and cook meat/beans/veggies until done; drain excess moisture
Preheat a skillet on medium heat
Place a tortilla in the skillet
Sprinkle an even layer of shredded cheese over half the tortilla
Add fillings on top of the cheese
Sprinkle a little more cheese over fillings
Fold the tortilla in half
Cook 2–4 minutes per side, until golden and crisp and the cheese is melted
Remove to a plate and repeat with remaining tortillas and fillings
Serve hot with salsa and sour cream, if desired