01 - Preheat oven to 425°F. Line two baking sheets with parchment paper.
02 - In a large bowl, toss shredded chicken with chili powder, cumin, garlic powder, salt, and black pepper until evenly coated.
03 - Lay 4 tortillas flat. Distribute seasoned chicken, cheese, bell pepper, and green onions evenly over each, leaving a 1/2-inch border.
04 - Top with remaining tortillas and press gently to seal. Brush both sides of each quesadilla with melted butter or olive oil.
05 - Place quesadillas on baking sheets. Bake 8-10 minutes, flip, and bake 7-8 minutes longer until golden and crisp.
06 - Let cool 2 minutes, then cut into wedges. Serve warm with salsa, sour cream, or guacamole if desired.