Cheese Filled Coffee Cake
["1 pkg. yeast", "4 Tbsp. warm milk", "1 Tbsp. sugar", "2 1/2 c. flour", "1/2 tsp. salt", "1/2 lb. margarine", "4 egg yolks"]
["Mix yeast, milk and sugar and let stand until dissolved.", "Mix flour and salt and cut into cold margarine.", "Add egg yolks and yeast mixture; mix well."]
["yeast", "warm milk", "sugar", "flour", "salt", "margarine", "egg yolks"]