This Oatmeal Mug Cake is ultra soft, light and fluffy with chewy bits of rolled oats. Made without eggs, it's absolutely amazing any time of the day. It's like a microwave breakfast muffin in a mug!
5 Star Reviews
From Karo: "made this lovely mug cake for the first time and let me tell u it’s the most delicious mug cake i’ve eaten. just perfect, and a perfect portion as well." 
From Aeryn: "Super tasty and easy to make!
I was worried that it would be a little bland since the only flavouring is a ¼ teaspoon of cinnamon but I really enjoyed it. I made it in a bowl and did it for 10 seconds less and it worked perfectly, doesn't even need any toppings but it's still nice to add."
This microwave oats mug cake is like a warm, fluffy oatmeal muffin in a mug—ready in just 5 minutes! It’s soft and tender, with chewy bits of rolled oats that give it a satisfying texture. Perfect for a light breakfast, a cozy late-night snack, or a quick after-school treat for the kids.
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👩🍳 Why our recipe?
Texture: Soft, light, and fluffy with a hint of chew from the rolled oats.
Quick and easy: If you are craving an oatmeal cake, then it can't get easier than this!
Not too sweet: Brown sugar adds just the right touch of caramel flavor without overpowering the sweetness.
Perfect any time of the day: Perfect for a light breakfast, late-night snack, after-school treat, or even a sweet post-dinner dessert.
Short Video
Ingredients You’ll Need To Make Oatmeal Mug Cake
Scroll down to the recipe card below for full information on ingredients and amounts.
- Oats – Old-fashioned rolled oats are ideal for this oat mug cake because they provide the best texture—soft with a slight chew. They hold their shape during cooking, unlike quick cooking oats, which can become mushy.
- Flour – All-purpose flour adds structure and helps prevent the oats from sinking to the bottom, ensuring a more uniform texture.
- Sugar – Golden brown sugar adds more than sweetness—it brings a subtle caramel flavor and helps retain moisture, giving the cake a soft, tender crumb.
- Milk – Milk hydrates the oats and flour while keeping the oatmeal cake soft and moist. You can use any kind—dairy or non-dairy, like almond or oat milk.
- Oil – Just a small amount of neutral oil, like vegetable or canola, keeps it soft and prevents it from turning rubbery or dry, which can sometimes happen in microwave baking.
- Baking Powder – This leavening agent is key to achieving a light, fluffy texture. It helps the microwave oats cake rise and prevents it from becoming overly dense.
This cozy oats microwave cake is super versatile—perfect for any time of day!
Kid-Friendly Snack – Stir in some chocolate chips before microwaving and serve as a quick after-school snack. It’s soft, warm, and just sweet enough to feel like a treat!
For Breakfast – Top it with a dollop of sweetened Greek yogurt and a handful of fresh berries or sliced banana for a wholesome and satisfying start to your morning.
As a Light Dessert – Dress it up with a swirl of whipped cream and a drizzle of Nutella or maple syrup for a warm, sweet treat.
Oatmeal Mug Cake
Ingredients
- 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
Toppings (optional)
- Sweetened greek yogurt or whipped cream
- Fresh berries
Instructions
- Add first 6 ingredients (oats, flour, brown sugar, baking powder, cinnamon and salt) into a microwave safe mug and stir well.
- 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.
Notes
Nutrition
Nutritional information, based on third-party calculations, should be seen as estimates, not guarantees, as various factors like product types, brands, processing methods, and more can alter the nutritional content in recipes.
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How to make an oat mug cake in microwave?
You can find full printable recipe below, but here is a quick overview of the procedure along with step-by-step photos.
⏰ 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).
Tasty Add-Ins for Your Oatmeal Mug Cake
One of the best things about this recipe is how easy it is to customize! Whether you're craving something chocolatey, fruity, or spiced, here are a few delicious mix-in ideas to make it your own:
- Chocolate Chips – Stir in a tablespoon of semi-sweet chocolate chips for melty pockets of sweetness, similar to what we love in our banana mug cake.
- Warm Spices & Flavorings – Swap or complement the cinnamon with fall favorites like pumpkin spice, ground ginger, or nutmeg. You can also add a splash of vanilla extract.
- Golden Raisins – Just like in our favorite carrot mug cake, a spoonful of golden raisins adds a chewy bite and natural sweetness.
Recipe tips
- 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 microwave mug cakes, some might dry out a little when left at room temperature.
- Type of mug to use - As with all mug cake recipes, any microwave safe coffee mug is best. The batter will rise significantly when cooking. So, make sure that mug is big enough.
More mug cake recipes without egg
More Oatmeal Dessert Ideas You'll Love
If you can’t get enough of oats in your desserts, here are a few more cozy, wholesome treats to try:
- These Oatmeal Cookies without eggs are naturally sweetened with mashed banana instead of eggs, and loaded with chocolate chips for a kid-approved favorite.
- Cozy Blueberry Crisp pairs juicy baked blueberries with a nutty coconut-almond oat streusel for the perfect contrast of soft and crunchy.
- Breakfast Cookies are the kind of recipe that proves cookies can be both healthy and satisfying for breakfast. Made with hearty oats, they have a chewy center, crispy edges, and are packed with nourishing ingredients.
- Air Fryer Apple Crisp is the ultimate small-batch dessert made with cinnamon-spiced apples and a crispy oat-almond topping. It’s ready in under 20 minutes and absolutely divine served warm with ice cream.
- Healthy Carrot Cookies may not win beauty contests, but they shine when it comes to clean ingredients and flavor.
- Oat Flour Cookies are soft in the center with lightly crisp edges and just the right amount of chocolatey goodness. They’re not too sweet and come together in about 30 minutes.
I hope you love this delicious and easy recipe – be sure to give it a review below! Also don’t forget to follow Kitchen at Hoskins on TikTok, Facebook, Instagram, Pinterest, and YouTube!
Barbara
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.
Maria Doss
Hi Barbara,
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
Caroline
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 🙂
Maria Doss
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
Cedric
Tried it out, added like 1 1/2 tbsp of "hand-crushed walnuts" for crunch - pretty good! Quick to make in a pinch, smooth and tasty, very muffin like. I might cut back by half a tablespoon of sugar next time and make my pinch of salt smaller (i did a tad less than 1/4 tsp and it was tasty, but a bit heavy on the palate). I mostly eyeballed (~2 min) the microwave since mine is from the 80's and isn't digital.
Maria Doss
That’s so great to hear! So glad you enjoyed it hun and thanks for the details – Maria ♡
Jay
Great recipe! Since I didn't have any brown sugar, I used coconut sugar instead and used only half as much. Instead of vegetable oil, I used avocado oil.
Maria Doss
hat’s so great to hear! So glad you love it – Maria ♡
Ann C
I've been making quite a few mug cakes lately. This one was very good! I agree with Cedric to cut back on the sugar next time. A half tablespoon less sugar is a good idea. Other than that, I loved the flavor and chewy texture of the cake. I might try letting it sit for an additional minute after mixing the dry and wet ingredients together and see if I like it less chewy. Thank you!
Maria Doss
Appreciate the feedback Ann, thanks for trying - Maria
karo
made this lovely mug cake for the first time and let me tell u it’s the most delicious mug cake i’ve eaten. just perfect, and a perfect portion as well.
Maria Doss
That’s so great to hear, so glad you loved it - Maria ♡
Aeryn
Super tasty and easy to make!
I was worried that it would be a little bland since the only flavouring is a ¼ teaspoon of cinnamon but I really enjoyed it. I made it in a bowl and did it for 10 seconds less and it worked perfectly, doesn't even need any toppings but it's still nice to add.
Maria Doss
That’s so great to hear, so glad you loved it - Maria ♡
Maria Doss
That’s so great to hear, so glad you loved it - Maria ♡
Briana
I doubled this and put in a microwave safe bowl so I could serve more people. I added vanilla, one egg, chopped pecans and fresh blueberries and cooked for 2 min 30 sec. It was stupendous! Great base recipe.
Maria Doss
Love to hear that - Maria ❤️