01 - Preheat the oven to 425°F (220°C). Line a large rimmed sheet pan with parchment paper or lightly grease with nonstick spray.
02 - In a large mixing bowl, combine red and green bell peppers, red onion, corn, jalapeño, shredded chicken or black beans, ground cumin, smoked paprika, chili powder, garlic powder, salt, and black pepper. Toss the mixture until evenly combined.
03 - Position 6 large flour tortillas around the edges of the prepared sheet pan, allowing half of each tortilla to hang over the rim. Place 1 additional tortilla in the center to fully cover the base.
04 - Spread the filling mixture evenly over the tortillas on the pan. Distribute the shredded cheddar and Monterey Jack cheeses evenly over the top of the filling.
05 - Fold the overhanging edges of the tortillas towards the center to enclose the filling. Place the final tortilla over the top to seal any exposed filling.
06 - Place a second sheet pan on top to compress the quesadilla and promote crispness. Bake in the preheated oven for 20 minutes.
07 - Remove the top sheet pan and continue baking for an additional 3 to 5 minutes until the surface is golden brown and crisp.
08 - Allow the quesadilla to cool on the pan for 2 minutes. Slice into squares and serve with desired garnishes.