Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Dice the sweet potato into 1/2-inch cubes and chop the red bell pepper into bite-sized pieces.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken breast, sweet potato cubes, broccoli florets, and bell peppers onto the prepared sheet pan.
Pour the lemon-herb marinade over the chicken and vegetables, tossing thoroughly to ensure every component is evenly coated.
Arrange the ingredients in a single layer, ensuring the chicken has enough space to roast properly.
Bake for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.