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 bite-sized pieces and dice the potatoes, carrots, and red onion into similar small sizes to ensure even cooking.
Place the chicken, potatoes, carrots, onion, and broccoli florets into a large mixing bowl.
Add the minced garlic, olive oil, dried oregano, dried thyme, sea salt, and black pepper to the bowl, tossing thoroughly until everything is evenly coated.
Spread the mixture in a single layer on the prepared sheet pan, ensuring the ingredients are not overcrowded so they roast rather than steam.
Bake for 20 to 25 minutes, or until the chicken is cooked through and the potatoes are tender and golden brown.
Remove from the oven and garnish with freshly chopped parsley before serving or portioning into containers for meal prep.