Instructions: 1. Blend butter or margarine and sugar in a bowl; stir in egg yolk and vanilla. Sift flour and salt into bowl; mix well. Chill 1 hour. Roll into 1-inch balls.

2. Dip into slightly beaten egg white. Roll in nuts. Place 1-inch apart on cookie sheet.

3. Bake in moderate oven (350 degrees) 5 minutes. Press thumb gently in center of each; bake 5 minutes longer. Cool. Fill with frosting. Garnish with "M&Ms" Peanut Chocolate Candies.

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