Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel the sweet potato and cut it into 1-inch cubes. Slice the chicken breast into bite-sized pieces.
In a large mixing bowl, toss the sweet potato cubes and chicken pieces with olive oil, rosemary, thyme, garlic powder, sea salt, and black pepper until evenly coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring space between pieces for even browning.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the sweet potatoes are tender and golden.
While the chicken and potatoes roast, steam the broccoli florets for 5 minutes until tender-crisp and bright green.
Divide the roasted chicken, sweet potatoes, and steamed broccoli into a bowl and serve immediately.