Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Dice the chicken breast into 1-inch pieces and place them into a large mixing bowl.
Chop the broccoli into bite-sized florets, slice the red bell pepper into thin strips, and slice the zucchini into rounds.
Add all the prepared vegetables into the bowl with the chicken.
In a small ramekin, whisk together the extra virgin olive oil, lemon juice, minced garlic, dried oregano, sea salt, and black pepper.
Pour the lemon-herb mixture over the chicken and vegetables, tossing well until every piece is glistening and evenly coated.
Spread the mixture out in a single layer on the prepared sheet pan, making sure not to crowd the ingredients so they roast properly.
Roast for 20-22 minutes until the chicken is cooked through and the vegetables are tender with slightly charred, caramelized edges.