Beef and cheese quesadillas are a quick and easy meal that is perfect for busy weeknights. The ground beef is cooked with onions, garlic, and spices, then layered with shredded cheese between tortillas. The quesadillas are cooked until the cheese is melted and the tortillas are crispy. Serve these delicious quesadillas with salsa, guacamole, and sour cream for a satisfying and flavorful meal.