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 bite-sized pieces and place them into a large mixing bowl.
Prepare the vegetables by chopping the broccoli into small florets, slicing the bell pepper into strips, and cutting the carrots into thin rounds.
Add all the prepared vegetables into the bowl with the chicken pieces.
Drizzle the extra virgin olive oil and fresh lemon juice over the mixture, then sprinkle with dried oregano, garlic powder, sea salt, and black pepper.
Toss everything thoroughly with your hands or a large spoon until the chicken and vegetables are evenly coated with the oil and seasonings.
Spread the mixture in a single layer on the prepared baking sheet, making sure not to overcrowd the pan so the chicken can crisp up.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and serve immediately while hot.