Line quiche or pie pan with pastry. Bake for 10 minutes. Cook sausage with onions until brown, drain. Combine sausage with mushrooms, parsley flakes, garlic, Cheddar cheese, eggs and chopped green pepper and mix well. Spoon into crust and top with cheese. Combine milk and eggs, beat until foamy and pour over cheese. Sprinkle with paprika and bake at 325 degrees for 50 minutes or until cheese is lightly browned and quiche is set.