For the crispiest oven baked quesadillas, use a preheated oven at 400°F (200°C) and lightly brush the tortillas with oil. Baking times may vary slightly depending on your oven, but 8 to 10 minutes usually gives the perfect golden crunch. You can customize the fillings with cooked chicken, sautéed vegetables, or beans for added flavor. No need to flip the quesadillas if you bake them on a wire rack – both sides will crisp evenly!