In a medium size bowl, stir together the flour, cornstarch, baking soda and salt.
In a large separate bowl, beat together the butter, bacon grease and both sugar with a hand held mixer or a stand up mixer. Then add in the eggs and vanilla extract. Mix until well combined.
Gradually stir the flour mixture into the butter until just combined. I recommend stirring in the flour by hand and be careful not to over mix.
Then fold in the chopped bacon and chocolate chips.
Place the cookie dough onto a baking sheet using a cook scoop or rounded tablespoon.
Bake for 8-10 minutes until the edges of the cookies are slightly browned.
Remove the pan from the oven and allow the cookies to sit on the baking sheet for 5 minutes. Then move them to wire racks to cool completely.
Then the cookies are ready to serve and enjoy!
Notes
Store any leftover cookies in an airtight container or ziplock bag at room temperature for up to 1 week. I store a piece of bread in the container with the cookies to keep them moist.