Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
Dice the yellow potato into 1/2-inch cubes. In a bowl, toss them with half of the olive oil, sea salt, and garlic powder.
Spread the potatoes in a single layer on the baking sheet and roast for 15 minutes.
While the potatoes roast, cut the chicken breast into bite-sized pieces and slice the red bell pepper and onion.
In the same bowl used for potatoes, whisk together the remaining olive oil and the chipotle peppers in adobo sauce.
Add the chicken, bell peppers, and onions to the bowl, tossing until everything is thoroughly coated in the spicy marinade.
Remove the baking sheet from the oven, push the potatoes to one side, and add the chicken and vegetable mixture to the other side.
Return the pan to the oven and roast for an additional 12-15 minutes until the chicken is cooked through and the potatoes are golden and crispy.
Garnish with freshly chopped cilantro before serving.