Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Dice the gold potatoes into uniform 1/2-inch cubes and slice the chicken breast into 1-inch bite-sized pieces.
In a large mixing bowl, whisk together the olive oil, chili powder, smoked paprika, garlic powder, sea salt, black pepper, and cayenne pepper until well combined.
Add the chicken and potatoes to the bowl, tossing thoroughly to ensure every piece is coated in the spicy oil mixture.
Spread the chicken and potatoes in a single layer on the prepared baking sheet, making sure they are not overlapping to ensure a crisp roast.
Bake for 22-25 minutes, flipping the ingredients halfway through, until the potatoes are tender and the chicken reaches an internal temperature of 165°F.
Transfer the roasted chicken and potatoes to a large serving platter.
Squeeze the juice from the whole lime over the platter and garnish with freshly chopped cilantro before serving.