Chocolate Thumbprint Cookies

Directions

• In a large bowl, cream butter and sugar until light and fluffy. Beat in the egg yolk, milk and vanilla. Combine the flour, cocoa and salt; gradually add to creamed mixture and mix well. Cover and refrigerate until easy to handle, about 1 hour.
• In a small bowl, whisk egg white until foamy. Shape dough into 1-in. balls; dip in egg white, then roll in nuts. Place on greased baking sheets. Using a wooden spoon handle, make an indentation in center of each cookie. Bake at 350° until center is set, 10-12 minutes.
• For filling, combine the confectioners' sugar, butter, milk and vanilla; stir until smooth. Spoon or pipe 1/4 teaspoon into each warm cookie; gently press a chocolate kiss in the center. Carefully remove from pans to wire racks to cool.