Preheat your oven to 400°F (200°C).
In a small bowl, combine the garlic powder, parsley flakes, paprika, salt, black pepper, dried rosemary, and cayenne pepper.
Arrange the chicken breasts and potato wedges on a large sheet pan.
Drizzle the olive oil evenly over both the chicken and potatoes, tossing gently to coat.
Sprinkle the seasoning mixture evenly over everything, making sure all sides are coated.
Spread the chicken and potatoes into a single layer for even roasting.
Bake for 35–40 minutes, or until the Garlic Herb Chicken with Potatoes reaches an internal temperature of 165°F (74°C) and the potatoes are fork-tender with crispy edges.
Garnish with fresh chopped parsley before serving.