Chocolate Chip Angel Cookies

This recipe is from one of Jeff's cousins on the Jansen side.  They are sooo sooo good!

2 1/2 to 3 c. flour
1 t. baking soda
1 t. cream of tartar
1/4 t. salt
1/2 c. butter, softened
1/2 c. vegetable shortening
1/2 c. lightly packed brown sugar
1/2 c. granulated sugar
1 egg
1 t. vanilla
6 oz. chocolate chips

Beat butter, shortening and sugars in large bowl until well blended.  Add egg, beat well.  Add vanilla.  Add flour, soda, cream of tartar and salt.  Blend well, stir in chips.  Roll dough into walnut sized balls.  Roll in granulated sugar.  Place 2" apart on lightly greased cookie sheet.  Bake at 350* for 12-15 minutes.