Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper to ensure the food doesn't stick without the use of oil.
Slice the chicken breast into even 1-inch strips and place them into a large mixing bowl.
Add the broccoli florets, sliced carrots, and chopped red bell pepper to the bowl with the chicken.
In a small ramekin, whisk together the lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Pour the lemon-herb mixture over the chicken and vegetables, tossing thoroughly until every piece is evenly coated.
Spread the mixture in a single, even layer on the prepared baking sheet, ensuring the pieces are not overcrowded to allow for proper roasting.
Bake for 20 to 25 minutes, or until the chicken is opaque and cooked through and the vegetables are tender-crisp.
Remove from the oven and garnish with freshly chopped parsley before serving warm.