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

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

Bake 350-degrees F. 5 minutes. Press thumb gently in center of each; bake 5 minutes longer. Cool. Fill with frosting. Garnish with one peanut M&M on each cookie.

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