Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into 1-inch cubes and slice the zucchini and bell pepper into bite-sized pieces.
Mince the garlic clove finely.
In a large mixing bowl, combine the chicken, zucchini, bell pepper, and cherry tomatoes.
Drizzle with olive oil and lemon juice, then add the minced garlic, dried oregano, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and seasonings.
Spread the mixture out in a single layer on the prepared baking sheet to ensure even roasting.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
Remove from the oven and immediately sprinkle the crumbled feta cheese over the hot chicken and vegetables before serving.