Use small chunks of unpeeled potato instead of the polenta.
Heat oven to 220C/fan 200C/gas 7. Using your fingers, roughly break up the polenta into small chunks and scatter in the bottom of a small roasting tin. Tip in the parmesan and mix. Sit the chicken breasts, cherry tomatoes, rosemary and garlic on top of the polenta, drizzle with olive oil, then season to taste.
Roast for 25 mins until the chicken skin is crisp and golden, and the polenta and cheese are
turning crusty around the edges. Serve with a