Preheat oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Dice the chicken breast and sweet potato into 1-inch cubes, and chop the broccoli, bell pepper, and zucchini into bite-sized pieces.
In a small bowl, whisk together the olive oil, lemon juice, minced garlic, oregano, thyme, sea salt, and black pepper.
Place the chicken and vegetables on the prepared sheet pan and pour the lemon-herb marinade over the top, tossing well to ensure everything is evenly coated.
Spread the mixture in a single layer, ensuring the chicken pieces are not touching for even browning.
Roast for 20-25 minutes, or until the chicken is cooked through and the sweet potatoes are fork-tender and golden.
Divide into meal prep containers and garnish with fresh parsley if desired.