Peppermint Sandwich Cookies

Directions

1. Cream butter and sugar until light and fluffy, 5-7 minutes. Beat in vanilla. In another bowl, whisk flour and salt; gradually beat into creamed mixture.
2. Divide dough in half. Roughly shape each portion into a 12-in. roll along the edge of a 12x12-in. sheet of waxed paper. Tightly roll waxed paper over dough, using the paper to mold the dough into a smooth roll. Securely wrap waxed paper-covered roll in a freezer container; refrigerate until firm, about 1 hour.
3. Preheat oven to 350°. Unwrap and cut dough crosswise into 1/2-in. slices. Place 2 in. apart on parchment-lined baking sheets. Bake until edges begin to brown, 13-15 minutes. Remove from pans to wire racks to cool completely.
4. In a microwave, melt chocolate chips; stir until smooth. Stir in extract. Spread on the bottoms of half of the cookies; cover with remaining cookies. Let stand until set.