Preheat your oven to 400°F and line a baking sheet with parchment paper.
Peel the sweet potato and cut it into 1/2-inch cubes.
Toss the sweet potato cubes on the baking sheet with 0.5 tbsp olive oil, 0.25 tsp sea salt, and 0.5 tsp garlic powder.
Roast the sweet potatoes for 20-25 minutes, tossing halfway through, until they are tender and slightly browned.
In a small bowl, whisk together the remaining 0.5 tbsp olive oil, lime juice, minced chipotle peppers, 0.5 tsp garlic powder, and black pepper to create a marinade.
Coat the chicken breast thoroughly with the chipotle marinade and let it sit for 5 minutes.
Heat a grill pan or outdoor grill over medium-high heat and lightly grease with oil spray.
Grill the chicken for 6-7 minutes per side, or until the internal temperature reaches 165°F.
While the chicken rests, thinly slice the bell peppers and sauté them in the grill pan for 3-4 minutes until they have light char marks.
Slice the chicken and serve it alongside the roasted sweet potatoes and sautéed peppers, garnished with freshly chopped cilantro.