Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Dice the chicken breast and sweet potatoes into uniform 1-inch cubes to ensure even cooking.
In a small bowl, whisk together the olive oil, honey, Dijon mustard, garlic powder, dried thyme, sea salt, and black pepper.
Place the chicken, sweet potatoes, broccoli florets, and sliced bell peppers onto the prepared baking sheet.
Pour the honey mustard glaze over the ingredients and toss thoroughly until everything is well coated.
Spread the mixture into a single layer and bake for 25 to 30 minutes, or until the chicken is cooked through and the sweet potatoes are fork-tender.
Allow the meal to cool slightly before portioning into airtight containers for a perfect make-ahead dinner.