Pasta is cooked to polusvaryavane in salted water, rinsed with hot water, drained and mixed with half butter. In a baking dish, greased with some of the butter, pour 1/2 of the pasta and sprinkle with grated feta cheese, mixed with thyme. On the feta cheese spread evenly chopped sausages and cover with remaining macaroni. Pour remaining melted butter and beaten egg with a pinch of salt. Sprinkle with pepper, cover with a lid and bake in a hot oven for 30 minutes. Immediately after removing from the oven to scatter with grated cheese. Separately served sauce of your choice.