This Oatmeal Mug Cake is ultra soft, light and fluffy with chewy bits of rolled oats. Made without any eggs, it's absolutely amazing any time of the day.
I wanted a soft, and not dense cake made using rolled oats. I played around with proportions of oats to flour, to keep the cake from collapsing or becoming gummy.
Oatmeal mug cake is a warm snack or a light breakfast made from oats, flour, milk, and other kitchen staples. Instant pot oatmeal or air fryer oatmeal has a creamy porridge consistency, but this recipe is like an oat muffin that's ready in in under 5 minutes.
Unlike a traditional oatmeal cake, stirring dry rolled oats without any hydration, minimized the released starch, thus resulting in a light texture.
You can top with berries or sliced bananas and walnuts for a tasty topping. If you have ever craved eating a dessert for breakfast like this air fryer bread pudding, then this recipe is for you.
Why you'll love this?
- Brown sugar adds butterscotch like flavor.
- Prepped and cooked in one coffee mug
- Not overly sweet
- Soft, light, fluffy and flavorful
Scroll down to the recipe card below for full information on ingredients and amounts.
- Oats - Old-fashioned style rolled oats are the best and also what I recommend for eggless oatmeal cookies.
- Flour - All purpose flour gives stability to ensures the oats don't sink to the bottom.
- Sugar - We used golden brown sugar for caramel notes and moisture.
- Milk - Milk softens the oats and keeps the cake soft.
- Oil - A couple of tablespoons of vegetable oil prevents the dish from tasting rubbery.
- Baking powder- Baking powder prevents the oatmeal mug cake from tasting dense and lifts it all up!
Pro tip: This oatmeal mug cake recipe calls for using rolled or old fashioned oats. Quick cooking oats is much thinner and steel cut is hard to cook in the short microwave cooking time.
- Stir a tablespoon of semi sweet chocolate chips into the batter like in banana mug cake.
- Switch up the flavoring and use vanilla extract instead. Fall spices such as ground ginger, nutmeg or pumpkin spice can also be mixed along with cinnamon.
- Stir a tablespoon of golden raisins like the carrot mug cake recipe.
How to make?
You can find full printable recipe below, but here is a quick overview of the procedure along with step-by-step photos.
- Add rolled oats, all purpose flour, brown sugar, cinnamon, baking powder and salt into a microwave safe mug. Mix until thoroughly combined.
Tip: I recommend whole old-fashioned style oats for a hearty and satisfying texture.
2. Mix in milk and oil to make a smooth batter.
3. Microwave for about 1 minute and 45 seconds.
Tip: Cooking time will depend on the size of mug used. Wider mug will require slightly shorter time (1 minute + 40 seconds), whereas narrow mug will need about 10 seconds more (1 minute + 50 seconds).
Pro tip: For the best oatmeal mug cake texture, use whole oats and don’t over-cook. You want a deliciously soft & fluffy spoonful.
How to serve?
Serve for breakfast with a dollop of sweetened greek yogurt and some berries or sliced banana. Enjoy as a light dessert with sweetened whipped cream and Nutella.
- Oats - Use only rolled or old fashioned oats for this recipe and not quick cooking or instant oats.
- Brown sugar - Golden or light brown sugar gives the perfect molasses taste.
- Stir batter until lump free – Using a spoon, stir the oatmeal mug cake batter until smooth and no lumps remain.
- Best eaten hot – Enjoy this cake HOT! As with mug cakes, some might dry out a little when left at room temperature.
- Type of mug to use - Any microwave safe coffee mug. The batter will rise significantly when cooking. So, make sure that mug is big enough.
More Mug Cake recipes
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Oatmeal Mug Cake
- ¼ cup rolled or old fashioned oats
- 3 tablespoons all purpose flour
- 3 tablespoons light or golden brown sugar not packed
- ½ teaspoon baking powder
- ¼ teaspoon ground cinnamon
- 1 pinch salt
- ¼ cup milk whole or 2%
- 2 tablespoons vegetable oil
- Sweetened greek yogurt or whipped cream
- Fresh berries
- Add first 6 ingredients (oats, flour, brown sugar, baking powder, cinnamon and salt) into a microwave safe mug and stir well.Pro tip: This oatmeal mug cake recipe calls for using rolled or old fashioned oats. Quick cooking oats is much thinner and steel cut is hard to cook in the short microwave cooking time.
- Mix in milk and oil, until smooth and well combined.
- Microwave for 1 minute plus 40 seconds (if using a wide mug) or 1 minute plus 50 seconds (if using a narrow mug).Tip: Don't open the microwave while it's cooking.
- Remove mug from microwave, top with desired toppings and enjoy hot. Microwave cakes tends to get a little dry after some time.
Nutritional information is based on third party calculations, should be considered estimates and not be construed as a guarantee. Varying factors such as product types, brands purchased, produce, the way ingredients are processed and more change the nutritional information in any recipe.
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Dear Maria, what is the wattage of your microwave? Since you can't open the microwave in between, and the 1m 40s time seems long for 1100 watts, I'm not sure how to make it in my microwave.
We apologize for a late reply. When cooking for the first time, we recommend checking after 1 min and 30 seconds. If it doesn't look well risen and cooked through, then cook for an additional 10 to 20 seconds. Hope it helps, have a great weekend - Maria
I tried this today. The overall consistency was good but I found the hard bits to be disruptive (I would prefer plain porridge to this). Not my cup of tea, but not a bad recipe either 🙂
Hi Caroline, Hmmm.. not sure about the crunchy bits you are talking about. Did you use steel cut oats instead of rolled oats? Regular oats will soften during the cooking time and will add to the texture but not stay crunchy - Maria