Mix thoroughly, add grated hard cheese (85 g), and mix again.
Preheat the oven to 190 °C. Grease a large baking dish with butter (5 g) and place the chopped chicken breasts, vegetables, pieces of tomatoes (1–2 pieces), and sliced onion (1 piece) at the bottom.
Evenly pour the prepared creamy cheese sauce over everything, sprinkle with oregano (5 g), and optionally, almond crumbs (1 tbsp).