Double-chocolate Kiss Cookies

Ingredients

• Hershey's Kisses chocolates or Hershey's Hugs chocolates
  36 unit
• (1 stick) butter or margarine

  softened
  ½ cup
• sugar
  1 cup
• egg
  1 unit
• vanilla extract
  1½ tsp
• all-purpose flour
  1½ cups
• Hershey's cocoa
  ⅓ cup
• baking soda
  ½ tsp
• salt
  ¼ tsp
• milk
  ¼ cup
• (16 oz) vanilla ready-to-spread frosting (or make your own)
  1 can