Use finely ground almond flour for best texture; adjust microwave time depending on wattage; for fluffier cake, beat egg white separately; substitute almond milk with other unsweetened plant-based milks; use a mug that holds at least 12 ounces to avoid spillover. Variations include peanut butter swirl, mint chocolate, mocha kick, berry delight, and nutty crunch. Leftovers can be refrigerated for up to 3 days or frozen for longer storage.