Creating Sheet Pan Chicken al Pastor is straightforward. Just follow these simple steps:

1. Prepare the Marinade: In a large bowl, combine chili powder, cumin, smoked paprika, oregano, cinnamon, olive oil, and lime juice.
2. Add the Chicken: Toss the chicken thighs in the marinade, making sure each piece is well coated. Let it marinate for at least 30 minutes for optimal flavor.
3. Preheat the Oven: Preheat your oven to 400°F (200°C).
4. Prepare the Vegetables: On a large sheet pan, spread out the sliced red bell pepper and onion. Add the marinated chicken thighs on top.
5. Add Pineapple: Scatter the diced pineapple over the chicken and vegetables.
6. Season: Sprinkle with salt and pepper to taste.
7. Bake: Place the sheet pan in the oven and bake for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F (74°C).
8. Garnish: Remove from the oven and let it rest for a few minutes before garnishing with fresh cilantro.
9. Serve: Serve immediately with lime wedges on the side.