Preheat your oven to 425°F (220°C) and lightly coat a 9x13-inch sheet pan with oil or cooking spray.
In a large bowl, mix the shredded chicken, taco seasoning, chopped onion, black beans, corn, shredded cheese, and sour cream until well combined.
2 cups shredded cooked chicken, 1 ounce taco seasoning, 1 medium white onion, 1 cup canned black beans, 1 cup canned corn, 1 cup Mexican blend shredded cheese, 1 cup sour cream
Place two tortillas in the center of the prepared baking sheet, then arrange the remaining tortillas around the edges, slightly overlapping them to form a base with a small border. Evenly spread the chicken mixture over the tortillas.
8 to 10 large flour tortillas
Lay two additional tortillas on top of the filling, then fold the outer tortillas inward to enclose it. Lightly brush the surface with olive oil.
1 tablespoon olive oil
Set a second baking sheet on top of the quesadilla to weigh it down and bake for 15 minutes. Remove the top baking sheet and continue baking for another 10 minutes, or until the tortillas are golden and crisp.
Allow the quesadilla to cool slightly before slicing into wedges. Garnish with fresh cilantro or serve with your favorite toppings.
Fresh cilantro