Chocolate Peppermint Pinwheels

1 cup butter
1 1/2 c. sugar
2 eggs
2 T. milk
2 t. peppermint extract
2 1/2 c. all-purpose flour<
1/2 t. salt
1/2 t. baking powder
2 squares (1 oz. each) unsweetened chocolate, melted<
In a large mixing bolw, cream shortening and sugar until light and fluffy. Add eggs, milk and extract; mix well. Combine th eflour, salt and baking powder; gradually add to creamed mixture. Divide dough in half. Add chocolate to one portion; mix well. Roll each portion between waxed paper into a 16 in. x 7 in. rectangle, about 1/4 in. thick. Remove top sheet of waxed paper; place plain dough over chocolate dough. Roll up like a jelly roll starting with a long side. Wrap in waxed paper. Refrigerate or freeze. Bake at 375° for 7-8 min. Yields 4 doz.