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 chop the broccoli and red bell pepper into uniform sizes to ensure even cooking.
In a small mixing bowl, whisk together the extra virgin olive oil, minced garlic, lemon juice, dried oregano, sea salt, and black pepper.
Place the chicken pieces and chopped vegetables onto the prepared sheet pan.
Drizzle the lemon-garlic sauce over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure every piece is well-coated.
Spread the mixture into a single layer, making sure not to overcrowd the pan so the ingredients roast rather than steam.
Roast in the center of the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables have developed slightly caramelized edges.
Remove from the oven and serve immediately, optionally garnishing with a fresh squeeze of lemon.