Fantastic Chocolate Chip Cookies

Mom's Chocolate Chip Cookies
a double batch...

1 1/3 cup butter
1 1/3 cup shortening
2 cups sugar
2 cups brown sugar
4 eggs
4 teaspoons vanilla
6 1/2 cups flour
2 teaspoons baking soda
2 teaspoons salt
1 (12 ounce) bag chocolate chips

Preheat oven to 375 degrees.

Cream butter and shortening and two sugars together. Add eggs and vanilla. Beat until combined. Add flour, 2 cups at a time. Add baking soda and salt with last 2 cups. Stir in chocolate chips.

Drop by large tablespoons (or ice cream scoop) onto ungreased cookie sheets. 

Bake at 375 degrees for 8 minutes. Cookies will seem underdone when first removed, but will set as they cool!

NOTE:  Quite possibly the best chocolate chip cookie recipe I've ever made.  Seriously.
Source.http://www.shortstopblog.com/2008/12/christmas-cookie-12-moms-chocolate-chip.html
It also worked well as a deep dish option.