This soft Blueberry Banana Mug Cake combines oats, ripe banana, egg, and juicy blueberries in a quick single-serving treat. It cooks right in the microwave and is ready in just 4 minutes.
Published August 24, 2026 · Updated August 27, 2026
Add the oats and baking powder to a large microwave-safe mug and stir together. Add the egg and water and mix thoroughly. Mash the banana, then stir it into the batter along with the blueberries until everything is evenly distributed.
2 minMicrowave on high until the cake rises and the center is set. Microwave wattages vary, so begin checking near the end of the cooking time. Avoid cooking substantially longer than necessary because the cake can become dry or rubbery. Serving Suggestions Allow the mug cake to cool briefly before eating. Drizzle with honey or maple syrup and sprinkle with cinnamon. Fresh blueberries, banana slices, Greek yogurt, chopped nuts, or nut butter also make excellent toppings.
2 minThis mug cake is best served immediately while warm. If necessary, cover and refrigerate leftovers for up to 1 day.
Use a large mug because the cake rises during cooking. A very ripe banana provides more natural sweetness. Don't overcook the cake. Frozen blueberries can be added without thawing. Grind the oats first if you prefer a finer cake texture.
Yes. Add them directly from frozen.
Yes. The ripe banana already provides natural sweetness.
Yes. Use approximately the same weight of oat flour.
It was most likely microwaved too long. Stop cooking as soon as the center is set.
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