Chop the onion finely and stew in sunflower oil until soft. Add consecutively peppers, cut into strips, peas, tomatoes, chopped, red pepper and flour. Stir and pour into stew. Add the grated feta cheese, parsley and salt. Dish stir and put in a hot oven. Towards the end of baking pour a mixture of yogurt and the beaten eggs. Add and pieces of the butter. Bake again and serve.