Preheat the Oven: Begin by preheating your oven to 425°F (220°C). This ensures that your fajitas will cook evenly and achieve a deliciously charred flavor.
Prepare the Vegetables and Chicken: In a spacious mixing bowl, add the sliced chicken, red bell pepper, yellow bell pepper, green bell pepper, and red onion.
Mix the Seasoning: In a small bowl, whisk together the olive oil, chili powder, ground cumin, smoked paprika, salt, and black pepper until well combined. This spice blend will infuse your dish with robust flavors.
Combine: Pour the seasoning mixture over the bowl of chicken and vegetables. Using your hands or a spatula, toss everything thoroughly until the chicken and veggies are evenly coated with the spices.
Arrange on Sheet Pan: Line a sheet pan with parchment paper for easy cleanup. Spread the chicken and vegetable mixture in a single layer on the prepared pan, making sure they are not overcrowded.
Bake: Place the sheet pan in the preheated oven and bake for 20-25 minutes. The chicken should be fully cooked (reaching an internal temperature of 165°F or 74°C) and the vegetables tender. Stir halfway through cooking to ensure even roasting.
Warm the Tortillas: While the chicken and veggies are baking, warm your tortillas. You can do this by placing them in a dry skillet over medium heat for approximately 30 seconds on each side or by wrapping them in aluminum foil and placing them in the oven during the last 5 minutes of cooking.
Finalize: Once the baking time is complete, carefully remove the sheet pan from the oven and set it aside.
Serving Suggestions: Serve the sizzling chicken and veggies directly from the sheet pan, inviting guests to create their own fajitas by loading warm tortillas with the mixture. Encourage them to top their fajitas with fresh cilantro, slices of avocado, a squeeze of lime, dollops of sour cream, and a sprinkle of shredded cheese to enhance flavor and presentation.