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 place them in a large mixing bowl.
Add the broccoli florets and chopped red bell pepper to the bowl with the chicken pieces.
In a small jar or bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Pour the lemon-herb dressing over the chicken and vegetables, tossing thoroughly to ensure every piece is evenly coated.
Spread the mixture in a single layer on the prepared sheet pan, making sure not to overcrowd the ingredients so they roast properly.
Bake for 18 to 22 minutes until the chicken is cooked through and the vegetables are tender with slightly charred, golden edges.
Remove the pan from the oven and serve the chicken and vegetables immediately while they are hot and fragrant.