Prepare ingredients and preheat an oven to 180°C. Cut chicken fillet into medium pieces and tomato into small cubes. Shell onion and garlic and cut them finely, then slice mushrooms. Grate cheese on a small grater. You can replace chilli pepper with any mild pepper or don’t add it at all. Also, prepare baking molds. Either a few small ones or a big one will be good. Heat some seed oil in a frying pan, put chicken fillet in it and cook until golden brown. Then add onion and keep on frying until onion is soft ( about 5 minutes).