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 red potatoes into uniform 1/2-inch cubes and trim the woody ends off the asparagus spears.
Slice the chicken breast into even 1-inch bite-sized pieces to ensure they cook at the same rate as the potatoes.
In a large mixing bowl, combine the chicken, potatoes, and asparagus, then drizzle with olive oil.
Sprinkle the rosemary, thyme, garlic powder, sea salt, and black pepper over the mixture and toss thoroughly to coat every piece.
Spread the ingredients in a single, even layer on the prepared baking sheet, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Roast in the center of the oven for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the potatoes are fork-tender with golden edges.