Preheat your oven to 400°F (200°C).
In a bowl, combine the chipotle powder, olive oil, lime juice, minced garlic, salt, and pepper to create the marinade.
Place the chicken breast in the marinade and let it sit for at least 15 minutes to absorb the flavors.
Peel (if desired) and cube the sweet potato into bite-sized pieces. Cut the red bell pepper into strips.
Toss the sweet potato and bell pepper with a little olive oil, salt, and pepper, then spread them evenly on a baking sheet.
Roast the vegetables in the preheated oven for about 20-25 minutes or until they are tender and lightly caramelized.
While the vegetables roast, heat a grill pan or skillet over medium-high heat and cook the marinated chicken breast for 6-7 minutes per side, until the internal temperature reaches 165°F (74°C).
Slice the chicken and serve it alongside the roasted sweet potatoes and bell peppers.