For best texture, do not overmix the batter once the flour is added. Use a mug of at least 12 ounces and fill it no more than halfway to prevent overflow. Leftovers keep covered in the fridge for up to 2 days and reheat well in 15 to 20 second microwave bursts.
Keyword apple mug cake, easy mug cake recipe, microwave dessert, quick treats, single serving cake