Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the red potato into small half-inch cubes to ensure they get maximum crispiness during roasting.
In a small bowl, whisk together the chipotle powder, smoked paprika, garlic powder, sea salt, and black pepper.
Toss the potato cubes with half of the olive oil and half of the spice blend, then spread them in a single layer on the baking sheet.
Roast the potatoes for 15 minutes. While they roast, slice the bell pepper into strips and season the chicken breast with the remaining oil and spice rub.
Move the potatoes to one side of the tray and add the chicken breast and bell peppers to the other side.
Return the tray to the oven and roast for another 18-20 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden brown.
Let the chicken rest for 5 minutes before slicing it into strips.
Garnish the entire dish with freshly chopped cilantro before serving.