Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch cubes and dice the sweet potato into 1/2-inch cubes to ensure even cooking.
In a small bowl, whisk together the olive oil, honey, Dijon mustard, sea salt, black pepper, and garlic powder until the glaze is smooth.
Place the chicken, sweet potatoes, and broccoli florets on the prepared sheet pan.
Pour the honey mustard glaze over the ingredients and toss thoroughly with tongs to coat every piece evenly.
Spread the mixture into a single layer, ensuring the chicken and vegetables are not overcrowded on the pan.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the sweet potatoes are tender and golden.