Pinwheel Cookies

1/3 cup shortening
1/2 cup sugar
1 egg yolk
1/2 tsp vanilla
3 Tbsp milk
1/12 cup cake flour
1/2 tsp salt
1/2 tsp baking powder
1 oz melted square chocolate

Cream together sugar and shortening.
Add egg yolk, vanilla and milk.  Beat until mixed.
Sift and add flour, salt, baking powder

Divide into 2 parts
Add melted chocolate to one. 
Chill at least one hour.
Roll out on wax paper into the same sized squares. 
Place the chocolate on the white. 

Starting at one end, roll into a log-shape. 
Cut into cookie pieces. 

Bake in a 375 degree oven for 10-15 minutes.