Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized cubes and mince the garlic clove.
Slice the bell pepper into thin strips and prepare the broccoli florets.
In a small jar, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken, broccoli, and peppers in a large mixing bowl and pour the lemon-herb dressing over them, tossing until everything is thoroughly coated.
Spread the mixture in a single, even layer on the prepared sheet pan, ensuring pieces are not overlapping to allow for proper roasting.
Bake for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred, crispy edges.
Remove from the oven and serve immediately while the flavors are vibrant.