Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Dice the gold potatoes into uniform 1/2-inch cubes to ensure even roasting.
In a mixing bowl, toss the potatoes with 0.5 tablespoon of olive oil, dried rosemary, half of the garlic powder, sea salt, and black pepper.
Spread the potatoes in a single layer on the prepared baking sheet and roast for 15 minutes.
While potatoes are roasting, brush the chicken breast with the remaining olive oil and season with the remaining garlic powder.
Carefully remove the baking sheet from the oven, move the potatoes to one side, and place the chicken breast on the other side.
Return the sheet to the oven and roast for an additional 15 to 20 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden.
Remove from the oven and immediately squeeze the fresh lemon wedge over both the chicken and potatoes before serving.