Preheat the oven to 375 degrees F.
In a mixing bowl beat the shortening and butter with an electric mixer on medium to high speed for 30 seconds. Add 1 1/4 cups of the flour and the brown sugar and beat until thoroughly combined. Add the eggs, 1 at a time, and mix until incorporated. Add the vanilla and baking soda. Beat in the remaining 1 1/4 cups flour and mix until well combined. Stir in chocolate chips.
Using a large ice-cream scoop, place full scoops of the batter on a cookie sheet with no sides. Bake for 5 minutes or until they start to melt. Remove from oven and place on a cookie sheet with sides or a medium size jelly roll pan. Finish baking about 6 to 10 minutes or until cookie base is dark brown. Remove from oven and let cool. They can be sliced into squares or broken into pieces.
Recipe courtesy of Elizabeth Hudson, Webster, SD