Preheat oven to 425°F. Add 2 tablespoons of butter and reserved 2 tablespoons of bacon drippings to a 10 inch cast iron skillet or similar size oven safe skillet or baking dish. Place the skillet into the oven while it preheats.
Meanwhile, in a medium size mixing bowl, whisk together cornmeal, flour and salt. Make a well in the center.
In a separate bowl, whisk together buttermilk and eggs. Add to the dry ingredients, mixing until fully combined. Stir in cooked bacon and 1 heaping cup of cracklings by hand.
Remove skillet from oven and swirl to coat the bottom and sides. Pour the batter into the hot skillet sprinkling the reserved 1/2 cracklings on top.
Bake for 25-30 minutes or until golden and a toothpick inserted into the center comes back clean.