Bake until the cheese is melted and the quesadillas begin to brown and crisp on the bottoms, 7 to 9 minutes.
Remove the baking sheet from the oven and, using a wide metal spatula, flip each quesadilla.
Bake until browned on the second sides, 2 to 4 minutes.
Cool on the baking sheet for about 5 minutes.
If desired, cut the quesadillas in half, then serve cheese side up.