Bo & Ty Button Cookies

1/3 cup sugar
1/2 cup butter
1/2 tsp vanilla
1 cup flour
1/2 tsp salt
1 egg yolk
1 cup Bo & Ty Chocolate Discs

1.  Cream softened butter and sugar together
2.  Stir in egg yolk and vanilla
3.  Sift flour and salt together into mixture and mix
4.  Shape into balls
5.  Place on greased cookie sheet
6.  Make dent with thumb or end of spoon in center of each ball
7.  Bake 1/2 hour at 300
8.  While warm, press Bo and Ty Chocolate Discs into each dent