Chocolate Pinwheels Recipe

In a large bowl, cream butter and sugar until light and fluffy. Beat in egg yolk and vanilla. Combine the flour, baking powder and salt; gradually add to creamed mixture and mix well. Divide dough in half. Add melted chocolate to one portion; mix well. Refrigerate until chilled. Divide each portion of dough into fourths; shape each into a 5-in. log. Flatten into triangular-shaped logs. Brush long sides with milk. Assemble one large roll by alternating two chocolate and two plain logs. Repeat. Wrap in plastic wrap. Refrigerate for 4 hours or until firm. Unwrap each roll; cut into 1/4-in. slices. Place 2 in. apart on lightly greased baking sheets. Bake at 375° for 8-10 minutes or until set. Remove from pans to wire racks. Yield: about 3 dozen.