Spray one 13x18 sheet pan with non-stick cooking spray. Place six flour tortillas around the perimeter of the sheet pan with half of each tortilla on the pan and half hanging off (the center of each tortilla will be lying on the edge of the pan.)

Place one additional tortilla in the very center of the pan to cover the hole.

Heat the refried beans just enough that they are easy to spread. Mound the beans onto the tortillas and use an offset spatula to spread them into an even layer to cover all of the tortillas that are inside the perimeter of the pan.

Sprinkle the grated cheese over the beans, adjusting the amount to your personal preference.

Place one more tortilla over the center of the beans and cheese.

Now fold in each of the tortilla halves that are lying to the outside of the pan.

Spray the top of the tortillas with a coat of non-stick cooking spray.

Place a second sheet pan on top of the prepared quesadilla to help hold everything flat during cooking.

Bake for 20 minutes. Remove the top sheet pan and allow the quesadilla to brown to your liking.

Remove from the oven and use a knife or pizza cutter to cut the quesadilla into individual servings.

Serve with sour cream, salsa, cilantro, pico de gallo, avocado slices, etc.