Begin by preheating your oven to 425°F (220°C). To streamline cleanup, line a large baking sheet with parchment paper.
In a small mixing bowl, whisk together the olive oil, chili powder, ground cumin, garlic powder, onion powder, smoked paprika, salt, and pepper until well blended. This will create a fragrant marinade.
Place the chicken breasts in a spacious mixing bowl and pour the marinade over them. Toss the chicken until each breast is thoroughly coated, ensuring an even distribution of the spices.
Carefully arrange the marinated chicken breasts on the prepared baking sheet, leaving space between each piece for even cooking.
In a colorful display, scatter the sliced red, yellow, and green bell peppers, along with the sliced red onion, around the chicken on the sheet pan. Aim for an even distribution to help them cook uniformly.
For an extra burst of flavor, drizzle any leftover marinade over the vegetables, making sure they are lightly coated.
Place the baking sheet in the preheated oven and bake for about 25-30 minutes. The chicken should reach an internal temperature of 165°F (75°C) and the vegetables should be tender and slightly caramelized.
Once cooked, remove the sheet pan from the oven and allow the chicken to rest for 5 minutes. This helps retain its juices, ensuring a moist bite when sliced.
To serve, slice the chicken into strips and plate it beautifully with the roasted vegetables. Garnish with fresh lime wedges and sprinkle chopped cilantro on top for a zesty finish.
Notes
For best results, let the chicken rest before slicing.