Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash and dice the yellow potato into 1/2-inch cubes and cut the chicken breast into similar bite-sized pieces.
In a large mixing bowl, combine the chicken and potatoes with the olive oil, sea salt, black pepper, garlic powder, and smoked paprika, tossing until everything is thoroughly coated.
Spread the seasoned chicken and potatoes in a single layer on the prepared baking sheet, ensuring they aren't overcrowded so they can crisp up properly.
Roast in the center of the oven for 15 minutes.
While the tray is roasting, trim the woody ends off the asparagus spears and set them aside.
Remove the baking sheet from the oven, add the asparagus spears to the tray, and sprinkle the fresh rosemary over all the ingredients.
Return the tray to the oven and roast for an additional 10 to 12 minutes, or until the chicken is cooked through and the potatoes are golden and crispy.
Serve immediately while hot and enjoy the vibrant flavors.