Preheat oven at 350-degrees. Line a 13x9 pan with foil and grease with butter or nonstick spray.
Cream together the butter and bacon fat. Mix in the sugars until pale and fluffy, then add the vanilla and eggs.
In a separate bowl, sift together the flour, salt, and baking soda. Gradually mix the dry ingredients into the wet, until just combined. Fold in 1 cup of the chocolate chips along with the chopped bacon.
Press dough into prepared pan. Sprinkle the remaining chocolate chips over the top.
Bake for 22 to 25 minutes, until the middle passes the toothpick test. Cool until room temperature. Use foil to lift contents onto cutting board for easy slicing. Keep stored in sealed containers at room temperature or in the fridge.
OM NOM NOM!