Preheat oven to 200°C. Place the feta block in the centre of a large baking dish or sheet pan. Arrange chicken, cherry tomatoes, zucchini, and mushrooms around it. Add garlic, olive oil, oregano, paprika, chilli flakes, and pepper. Toss everything to coat. Roast for 20–25 minutes, until chicken is cooked through and vegetables are tender.