
Heat the butter or olive oil in a large non-stick skillet over medium-high heat.
Add one tortilla to the pan and scatter the cheddar cheese in an even layer all over the tortilla. Place the second tortilla on top of the cheese.
Cook for 2-3 minutes or until the bottom of the tortilla starts to become golden brown. Carefully flip the tortilla and cook on the other side for 2-3 minutes or until the bottom of the tortilla becomes golden brown.
Remove the quesadilla from the pan and place on a cutting board. Use a knife or pizza cutter to cut the quesadilla into 6 triangles. Serve with guacamole or your favorite dipping sauce.