Mango Fudge Refrigerator Ribbon Cookies

Directions

1. Cream butter and sugar until light and fluffy, 5-7 minutes. Beat in egg, milk and vanilla. In another bowl, whisk together flour, baking powder and salt; gradually add to creamed mixture.
2. Divide dough in half. Mix melted chocolate into 1 half; stir in miniature chips. Mix mango, pistachios and orange zest into remaining dough.
3. Line an 8x4-in. loaf pan with waxed paper, letting ends extend over sides. Press half the chocolate dough onto bottom of pan; top with half the mango dough. Repeat layers.
4. Lifting with waxed paper, remove dough from pan; fold paper over dough to wrap completely. Refrigerate dough in pan until firm, 2 hours or overnight.
5. Preheat oven to 375°. Unwrap and cut dough crosswise into 1/2-in.-thick slices; cut each slice crosswise into thirds. Place 2 in. apart on ungreased baking sheets.
6. Bake until edges are lightly browned, 10-12 minutes. Remove from pans to wire racks to cool.