Chocolate Chip Shortbread

1 cup margarine
1 cup butter
1 cup icing sugar
1 cup white sugar
4 cups flour
1 cup chocolate chips (or more if you like chocolate like I do)

Cream butter/margarine with both sugars until light and fluffy. Add in chocolate chips.
Add flour a little at a time, kneading the dough together until it is like playdough.
Roll dough to 1/2 inch thick, cut into shapes
Bake at 350 F until golden, don't overbake.

Optional icing:
Mix icing sugar with milk until it forms a thick but spreadable frosting. Ice cookies. Stick in face.