Chocolate Chunk Shortbread

Directions

1. Cream butter and sugar in a large bowl until light and fluffy, 5-7 minutes. Combine flour and cornstarch; stir into creamed mixture. Fold in chocolate.
2. Shape into 1-1/2-inch balls. Place 2 in. apart on ungreased baking sheets. Flatten with a glass dipped in confectioners' sugar. Chill on baking sheets until firm, about 1 hour.
3. Preheat oven to 300°. Bake until edges are lightly browned, 20-25 minutes. Remove to wire racks to cool completely.