Lemon Thyme Icebox Cookies

Directions

1. Cream butter, sugar, thyme and lemon zest until light and fluffy, 5-7 minutes. Beat in egg yolk. In another bowl, whisk flour, baking powder and salt; gradually beat into creamed mixture.
2. Roughly shape dough into a 12-in. roll along the edge of a 12x12-in. sheet of waxed paper. Tightly roll waxed paper over dough, using paper to mold the dough into a smooth roll. Place the wrapped roll in an airtight container; refrigerate 1 hour or overnight.
3. Preheat oven to 350°. Unwrap and cut dough crosswise into 1/2-in. slices. Place 2 in. apart on ungreased baking sheets. Bake until edges begin to brown, 12-15 minutes. Cool in pans 5 minutes. Remove to wire racks to finish cooling.