Prepare fillings: In a bowl, combine the shredded cheeses, chicken or beef, onions, bell peppers, salsa, sour cream, and guacamole.

Assemble quesadillas: Place a tortilla on a flat surface. Spoon about 1/4 cup of the filling onto one half of the tortilla. Fold the other half over the filling and press down to seal.

Cook: Heat a large skillet over medium heat. Cook the quesadilla for 3-5 minutes per side, or until golden brown and the cheese is melted.

Serve: Cut the quesadilla into wedges and serve immediately.

Tips:

You can use any type of cheese or filling you like.

For a vegetarian quesadilla, omit the chicken or beef.

You can add other ingredients to your quesadillas, such as mushrooms, spinach, or tomatoes.

Serve with your favorite dipping sauces, such as salsa, guacamole, or sour cream.

Enjoy your delicious and versatile quesadillas!