Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper or lightly grease it.
- In a large bowl, combine the shredded chicken, shredded cheese, diced onion, diced bell pepper, cilantro, cumin, chili powder, garlic powder, onion powder, salt, and pepper. Mix well.
- Lay the flour tortillas flat and evenly distribute the chicken and cheese mixture across the center of each tortilla. Fold the tortillas in half to enclose the filling.
- Brush the tops of the folded tortillas with olive oil or melted butter to help them crisp up nicely in the oven.
- Place the assembled quesadillas on the prepared baking sheet and bake for 10-12 minutes, flipping halfway through, until the tortillas are golden brown and crispy on both sides.
- Remove from the oven, let cool for a minute, then cut into wedges. Serve with your favorite sides like salsa, sour cream, or guacamole.