1 cup (2 sticks) unsalted butter, room temperature
1/2 cup packed light brown sugar
2 eggs, separated
1 teaspoon vanilla
2 cups flour
1/2 teaspoon salt
Finely chopped nuts
1 16-ounce can vanilla frosting (or homemade frosting)
Red and green plain or peanut M&M's
In bowl, cream together butter and brown sugar. Add egg yolks and vanilla. Blend flour and salt into mixture. Cover and chill dough 1 hour.
Preheat oven to 350 degrees. Roll dough into 1-inch balls. Dip each into egg whites that have been beaten slightly. Roll in nuts. Place balls 1 inch apart on ungreased cookie sheets. Bake in preheated oven 5 minutes. Remove from oven. Gently press your thumb, or use a thimble, to make an indentation in center of cookie, creating a shallow well.
Return to oven and bake 5 more minutes. Cool. Fill indentation generously with frosting and decorate with red or green M&M's.
Makes about 3 dozen.
From Nancy J. Stohs, food editor, Milwaukee Journal Sentinel