Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes and cut the chicken breast into similar bite-sized pieces.
In a small mixing bowl, whisk together the honey, Dijon mustard, extra virgin olive oil, sea salt, black pepper, and garlic powder until the glaze is well combined.
Place the chicken pieces, sweet potato cubes, and broccoli florets onto the prepared sheet pan.
Pour the honey mustard glaze over the chicken and vegetables, then use your hands or tongs to toss everything until evenly coated.
Spread the ingredients out into a single layer, ensuring they are not crowded so they roast rather than steam.
Bake for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the sweet potatoes are tender and lightly browned.
Remove from the oven and serve immediately while the glaze is warm and the broccoli is crisp-tender.