preheat oven to 350

cream together the butter and shortening, add brown sugar and granulated sugar continue mixing until it is creamy textured

add eggs and beat then mix in vanilla, beat until the mixture starts to gather together into a ball, almost like a meringue, if it won't set up place in fridge for 20 mins.

in separate bowl stir together the flour, baking soda and salt

once the butter, egg mixture has set up add the dry ingredients by the cup mixing well inbetween, add chocolate chips

drop by spoonfulls on to cookie sheet bake for 10-12 minutes til very lightly golden brown on the edges, pull from oven and let sit for 1 minute on hot cookie sheet then move to rack to finish cooling