Cook sausage and drain. Separate crescent rolls into 8 triangles, place on ungreased 12-inch pizza pan with points toward center, press over bottom and sides to form crust. Spoon sausage over and sprinkle with potatoes. Top with cheese. In a bowl, beat eggs, milk, salt and pepper. Pour onto crust. Sprinkle with parmesan cheese. Bake at 375 degrees for 25-30 minutes. Serve hot.