This is a recipe that was in my Taste of Home Magazine by Laura Bryant German, W. Warren, Massachusetts. These are a great twist on your standard thumbprint cookies with jam/jelly. The recipe called for walnuts, but we don't care for them and us pecans.
1In 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 for 1 hour or until or until easy to handle.
2In 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° for 10-12 minutes or until center is set.
3For 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.