Wash the chicken fillets, dab dry, cut into individual fillets and halve them crosswise. Wrap a slice of bacon around each piece and pin it with a wooden skewer if necessary. Peel and halve the onion and cut it into half rings. Wash and drain the cherry tomatoes. Wash the thyme, shake dry and pluck roughly into pieces
Heat the oil in a pan, fry the chicken medallions vigorously on all sides (approx. 5 minutes), season with salt and pepper. Remove the medallions from the pan. Add the onion to the hot frying fat and sauté briefly while stirring. Add cherry tomatoes and half of the thyme, steam for 1-2 minutes and deglaze with chunky tomatoes and cream. Bring to the boil, season with salt and pepper and simmer for 2-3 minutes
Put the tomato cream with the chicken and bacon crumbs in a wide casserole dish. Sprinkle with cheese and remaining thyme. Gratinate in a preheated oven (electric cooker: 250 °C/ convection oven: 225 °C/ gas: see manufacturer) for approx. 10 minutes. Serve with fresh baguette