Melt the butter or oil in a round, glass or ceramic ramekin ( I used a 3½ inch, 6 ounce ramekin).In a separate pinch bowl, mix baking soda and apple cider vinegar together ( it will be very fizzy and bubbly) Set aside.Add all the rest of ingredients to the ramekin, and whisk or stir with a fork very briskly.Add the baking Soda- cider vinegar mixture to the ramekin, and stir in well.Stir, scraping sides , until clump free, may have to stab at some stubborn clumps.Cook in Microwave for 1 minute and 30 Seconds, or can Bake in the oven at 400 F for 12 to 15 minutes, until middle is firm.Take a knife between the bowl and muffin and slide around to loosen edges.Cool enough to handle, then remove from bowl, and cut in half sideways.Toast in a buttered or oiled frying pan, until lightly browned on each side ( like a pancake) this is an important step, do not skip.Use a spatula to press the tops of muffins lightly down while pan toasting ( as seen in photo above).