Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel the sweet potato and cut it into uniform 1/2-inch cubes to ensure even cooking.
Slice the chicken breast into 1-inch bite-sized pieces.
In a large mixing bowl, combine the sweet potato cubes, chicken pieces, and broccoli florets.
Drizzle the avocado oil over the mixture and sprinkle with garlic powder, sea salt, and black pepper.
Toss everything thoroughly to coat and spread in a single layer on the prepared baking sheet.
Roast for 22-25 minutes, tossing halfway through, until the chicken is cooked through and the broccoli edges are crispy.
Drizzle the entire medley with fresh lemon juice before serving for a bright finish.