Heat oven to 425°F. Lightly oil a large rimmed sheet pan.
Toss bell pepper, red onion, and corn with about half the oil, salt, and pepper. Spread on the pan and roast 8–10 minutes.
Combine chicken, black beans, 2 cups cheese, cilantro, lime juice, taco seasoning, chili powder, and cumin. Stir in 2 tablespoons salsa.
Warm tortillas briefly so they bend easily (microwave 20–30 seconds).
Arrange tortillas to cover the pan, overlapping and letting edges hang over the sides to fold later.
Spread the chicken-bean mixture evenly over the tortillas. Scatter roasted veggies on top, then the remaining cheese.
Fold overhanging tortillas over the filling. Add a few more tortillas to cover gaps if needed and brush tops with remaining oil.
Bake 12–15 minutes until the cheese melts and tortillas turn golden. Broil 1–2 minutes for extra crisp edges if desired.
Rest 5 minutes. Cut into squares and serve with salsa and sour cream.
Notes
Try it with cooked chorizo or sautéed mushrooms instead of chicken. For freezer prep, assemble, cool, and freeze unbaked; bake from frozen at 400°F until hot and crisp, adding a few minutes as needed.This recipe is an original creation inspired by classic Sheet Pan Quesadillas Made Easy flavors. All ingredient ratios and instructions are independently developed.