Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch cubes and dice the sweet potato, broccoli, and bell pepper into uniform, bite-sized pieces.
Place the chicken and all vegetables onto the prepared sheet pan in a single layer.
Drizzle the olive oil over the ingredients and sprinkle evenly with the dried oregano, garlic powder, onion powder, sea salt, and black pepper.
Use your hands or a spatula to toss everything together until the chicken and vegetables are thoroughly coated in the oil and spices.
Spread the mixture out again to ensure nothing is overlapping, which allows for better browning and caramelization.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
If preparing for the week, let the meal cool completely before dividing into airtight glass containers and storing in the refrigerator for up to 5 days.