Peppermint Pattie Cookies

• 2/3 cup butter or margarine, softened
• 1 cup sugar
• 1 egg
• 1 tablespoon milk
• 1/2 teaspoon vanilla extract
• 1-1/2 cups all-purpose flour
• 1/3 cup HERSHEY'S Cocoa
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 24 to 26 small (1-1/2 inch) YORK Peppermint Patties 

1. Beat butter and sugar in large mixing bowl; add egg, milk and vanilla, blending thoroughly. Stir together flour, cocoa, baking soda and salt. Add to butter mixture, blending well. Refrigerate dough about 1 hour or until firm enough to handle. (Dough will be a little soft.)
   
2. 2 Heat oven to 350°F. Lightly grease cookie sheet or line with parchment paper. Remove wrappers from peppermint patties.
   
3. 3 Roll dough into 1-1/4 inch balls. For each cookie flatten ball slightly; press peppermint pattie into dough. Mold dough around pattie so that it is completely covered. Place on prepared cookie sheet.
   
4. 4 Bake 12 to 14 minutes or until cookie is set. Cool slightly; remove from cookie sheet to wire rack. Cool completely. About 2 dozen cookies.