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 well coated.
03 - Place 4 tortillas on a flat surface. Distribute seasoned chicken, cheese, bell pepper, and green onions evenly over each tortilla, leaving a 1/2-inch border around edges.
04 - Cover each filled tortilla with remaining tortillas. Press gently to seal edges.
05 - Brush both sides of each quesadilla with melted butter or olive oil.
06 - Place quesadillas on prepared baking sheets. Bake for 8–10 minutes, flip, and bake an additional 7–8 minutes until golden brown and crispy.
07 - Let cool for 2 minutes. Cut into wedges and serve warm with salsa, sour cream, or guacamole if desired.