Vanilla Pecan Thumb Print Cookies

My friend Cliss made these for her daughters wedding.  I now dream about eating these all night.  So I thought it might be good to get the recipe.

2 cubes butter
1 cup sugar
2 egg yolks (reserve whites)

--Cream sugar and butter until smooth, then add egg yolks.

Add:
1 tsp. vanilla
2 cups flour
1 tsp. salt

--Mix together.  Roll in a small ball (use scoop to make ball).  Roll ball in slightly beaten egg whites, then roll in chopped pecans (about 1 1/2 cups).  Place on parchments lined cookie sheet.  Bake at 350 degrees for 8 minutes.  Cool slightly and press into ball with your thumb or a small spoon to make a dent in the middle of the cookie.  Remove from pan and cool completely before frosting.

Frosting

2 cups powdered sugar
2 Tbsp. butter
1 tsp. vanilla
2-3 Tbsp. water

--Mix ingredients well then pour into pastry bag.  Put dots of frosting into dent in the center of each cookie.