Wash, peel, core an apple and chop into ¼-inch cubes.
Add chopped apple into a microwave safe coffee mug (preferably a large mug). Microwave for 2 minutes. Pro tip: Pre-cooking the apple chunks not only softens them but also removes excess moisture and enhances the flavor concentration.
Remove mug from microwave, stir in butter, until it is fully melted and then mix in milk. Tip: Use room-temperature butter! Cold butter reduces the temperature of apples drastically and affects the texture of the finished product.
Add remaining ingredients and mix very well, until thoroughly combined.
Microwave for 1 minute and 50 seconds for a wide mug or 2 minutes for regular mug (as shown in photos).
Pro tip: After the cooking time elapses, refrain from opening the microwave for an additional 10 to 20 seconds before removing the cake, as this in preventing any shrinkage of the apple mug cake.Serve hot!
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Notes
Mug size. Both large or medium size microwave safe coffee mugs work for this apple mug cake recipe. However, it is easier to mix the batter in a larger one.Cooking time. Cook for 1 min and 50 secs, if using a wide mug and 2 minutes, if using a medium mug.Best apples to use. I like to use Honey crisp, Golden Delicious, Fuji or Gala. You want to choose a fruit that is crisp, sweet, and tart.Sugar. It depends on the sweetness of the apple used. I used Gala, and 2 tablespoons of sugar was perfect.Stir batter until lump free. Using a spoon, stir the cake batter until smooth and no lumps remain.Best eaten hot. Enjoy this cake, because microwave cakes have a tendency to might dry a little when left at room temperature.