• Step 1: Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper or a silicone baking mat.
• Step 2: In a small bowl, combine the olive oil, chili powder, cumin, garlic powder, onion powder, salt, and pepper. Rub this spice mixture all over the chicken breasts.
• Step 3: Place the seasoned chicken on the prepared baking sheet and bake for 25-30 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C). Allow the chicken to rest for 5 minutes, then shred or chop it into bite-sized pieces.
• Step 4: Reduce the oven temperature to 375°F (190°C).
• Step 5: Lay the flour tortillas on the baking sheet, keeping them slightly overlapping. Evenly distribute the shredded chicken and shredded cheese over the tortillas. Top with any desired toppings.
• Step 6: Fold the tortillas in half to create the quesadillas, pressing down gently to seal them.
• Step 7: Bake for 12-15 minutes, or until the tortillas are golden brown and the cheese is melted and bubbly.
• Step 8: Remove the sheet pan from the oven and let the quesadillas cool for a few minutes before slicing and serving.