Dice bacon and brown in an iron skillet. Remove pieces and drain on a paper towel. Leave the bacon grease in the skillet, which you will use to cook your cakes.
Mix egg, coconut flour, coconut milk, seasoning, and sweet potato until well blended. Fold in bacon pieces and crab.
Using your hands, form patties. Fry in bacon grease in a skillet until done, turning once.