Chocolate Kiss Thumbprint
["1/2 c. butter", "1/2 c. sugar", "1 Tbsp. milk", "1/2 tsp. vanilla", "1 egg, separated", "1 sq. (1 oz.) unsweetened chocolate, melted and cooled", "1 c. flour", "1/4 tsp. salt", "3/4 c. chopped nuts", "30 milk chocolate Kisses or Hershey's Hugs, unwrapped"]
["Heat oven to 350\u00b0.", "Combine butter, sugar, milk, vanilla and egg yolk.", "Beat at medium speed with electric mixer until well blended.", "Add melted chocolate; mix well.", "Combine flour and salt. Add to chocolate mixture.", "Mix until blended.", "Form dough into 1 inch balls.", "Beat egg white slightly with fork.", "Coat balls with egg white.", "Roll in chopped nuts.", "Place 2 inches apart on lightly greased baking sheet.", "Press thumb gently in center of each cookie. Bake at 350\u00b0 for 7 minutes.", "Remove from oven.", "Place chocolate Kiss in each thumbprint.", "Return to oven for 1 minute.", "Remove to cooling rack.", "Makes 2 1/2 dozen 2 inch cookies."]
["butter", "sugar", "milk", "vanilla", "egg", "chocolate", "flour", "salt", "nuts", "milk"]