Pre-heat oven to 350 degrees.
If using a stand mixer, fit with paddle attachment. Cream together butter and shortening. Add in granulated sugar and white sugar and beat until light and fluffy.
Add in eggs, one at a time. Beat to combine. Add in vanilla and beat to combine.
Turn mixer speed to low. Add in baking soda and flour. Mix until just combined.
Fold in chocolate chips. I like to use a rubber spatula for this, it helps distribute the chips throughout all the dough.
Grease cookie sheets or line them with parchment.
Scoop tablespoons of dough onto a cookie sheet.
Bake at 350 degrees for 8-12 minutes or until the bottoms are just starting to turn brown. My family prefers cookies on the gooier side, so I tend to try and err on the side of caution by pulling them out a bit early. However, if you like crunchy cookies, leave them in a minute or two longer.