Make a healthy breakfast in a coffee mug in under two minutes in the microwave. Look for the muffin in a mug mix on my website along with cake in a cup and other variations. Add fruit, such as raisins, a few pieces of chopped apples, or dried apricots, if desired.
Whisk egg in a microwave-safe mug. Stir yogurt, walnuts, flour, flax, oats, honey, cinnamon, and baking powder into egg until well-combined.
Microwave until set, 90 to 100 seconds. Turn out over a plate to remove muffin from mug.