First, combine the coconut flour, psyllium husk powder, sea salt, and baking powder. Combine all the ingredients directly into a tall coffee cup (about 12 oz). You do not need to grease the coffee cup.
Step 2
Add in the egg. Mix very well. The mixture will be very thick at this point.
Step 3
Combine boiling water and apple cider vinegar. Add this to the mixture as well. Mix extremely well to incorporate any dry pieces.
Step 4
Cook for 90 seconds in the microwave. Add an extra 30 seconds if necessary. Carefully remove the mug bread from the coffee cup onto a cutting board. Allow to cool thoroughly. Then cut the mug bread into 3-4 slices and enjoy immediately.