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Microwave this oatmeal mug cake for just 90 seconds using a few simple ingredients, and you’ll have a light and moist breakfast or snack. Customize it with your favorite toppings for a quick and delicious treat!

An overhead shot of scooped mug cake with peanut butter and berries.
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Easy Oatmeal Mug Cake

Making a tasty and healthy breakfast or snack doesn’t get any simpler than this oat mug cake. Oats are a breakfast essential for us, whether it’s overnight banana oats, soft baked oatmeal banana bars, 3-ingredient banana oat pancakes, or baby oatmeal.

Here’s a collection of amazing oatmeal recipes for babies and toddlers.

What’s great about this oatmeal mug cake is that I can whip it up last minute if I haven’t prepped anything. I mean, who wouldn’t want cake for breakfast? It’s hearty, nutritious, filling, and a perfect breakfast or snack for babies and toddlers.

And if you are craving more 2 minute mug cakes, you’re going to love this banana mug cake and almond flour mug cake!

Ingredients

All the ingredients laid out on a white background.

I am highlighting just the ones that need further explanation. The complete list is in the recipe card below.

  • Oats – Quick oats or oat flour will work best as they absorb liquid quickly, resulting in a softer and less chewy texture compared to rolled oats. Do not use steel cut oats.
  • Overripe banana – The browner the better! They mash easier and add a stronger banana flavor.
  • Egg – helps create a light, fluffy texture. If egg-free, you can try adding 3 tablespoons of applesauce, yogurt, or milk.
  • Butter – can also use melted coconut oil
  • Milk – I prefer whole milk but use any milk of choice

Step-by-Step Instructions

All the wet ingredients added to a mug.

Step 1: Mash the banana in a microwave-safe mug. Then add all the ingredients (minus the oats and baking powder). Whisk the batter until combined.

All the ingredients combined and placed on a large plate.

Step 2: Add the oats and baking powder and whisk again. Microwave for 1 minute and 30 seconds.

Tips for Success

  • Be sure to add the dry ingredients at the end. It will help the batter from bubbling over.
  • The batter will rise significantly (and then settle) during cooking, so make sure to use a mug with enough height.
  • Place a plate underneath the cup when microwaving to catch possible spills.

Variations

You can take this oatmeal mug cake up a notch by adding any of these suggestions to the batter,

  • Finely chopped nuts – walnuts, pecans, etc.
  • Diced fruit – like blueberries, raspberries, strawberries
  • Finely grated carrots – a great way to get extra veggies into your child
  • Unsweetened cocoa powder – you should totally try this chocolate avocado pudding!
  • Mini chocolate chips – for a quick chocolate fix!

Serving Suggestions

Cooked oatmeal mug cake with peanut butter and berries.

While it’s tasty on its own, just like baked oatmeal, adding your favorite toppings makes the experience even more fun and delicious! Try adding,

Storage

While it’s best to consume the day of, it can be refrigerated for up to 3 days.

FAQ

Can I make this oat mug cake in the oven?

Follow the instructions exactly and place the oven-safe mug on a baking sheet. Bake at 350° Fahrenheit for 10-15 minutes, or until set. You may consider doubling or tripling the recipe since the cooking time takes longer. Why not make extra to enjoy later while you’re at it :).

How long should I microwave the mug cake?

The exact time will differ slightly as every microwave is different. Start checking after 90 seconds and add 10 or so more seconds for tall mugs. The top will be springy to the touch but don’t worry! It will continue to cook as it cools and will firm up.

Did you make this recipe? Leave a rating below and let me know how you liked the recipe! Your feedback means so much to me!

5 from 6 votes

Oatmeal Mug Cake

Microwave this oatmeal mug cake for just 90 seconds using a few simple ingredients, and you'll have a light and moist breakfast or snack.
Prep Time: 2 minutes
Cook Time: 2 minutes
Total Time: 4 minutes
Servings: 1
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Just enter your email and get it sent to your inbox! Plus you’ll get new recipes from us every week!

Ingredients 

  • 1/2 medium ripe banana
  • 1 egg
  • 1 tbs butter, melted
  • 1 tbs milk of choice
  • 1/2 teaspoon chia seeds
  • 1/2 teaspoon vanilla extract
  • 1/4 cup quick oats (25g)
  • 1/4 teaspoon baking powder

Instructions 

  • Mash the banana in a microwave-safe mug. Then add all the ingredients (minus the oats and baking powder). Whisk the batter until combined.
  • Add the oats and baking powder and whisk again. Microwave for 1 minute and 30 seconds. Top with your favoriting toppings and enjoy!

Notes

  • Be sure to add the dry ingredients at the end. It will help the batter from bubbling over.
  • The batter will rise significantly (and then settle) during cooking, so make sure to use a mug with enough height.
  • Place a plate underneath the cup when microwaving to catch possible spills.
  • Don’t overcook!  The exact time will differ slightly as every microwave is different. Start checking after 90 seconds and add 10 or so more seconds for tall mugs. It should be soft and moist with a little bit of moisture, which is good! It will continue to cook as it cools and will firm up.

Nutrition

Calories: 316kcal | Carbohydrates: 30g | Protein: 10g | Fat: 18g | Potassium: 382mg | Fiber: 4g | Sugar: 9g | Vitamin A: 651IU | Calcium: 131mg | Iron: 2mg
Like this recipe? Rate and comment below!

About Min

Thank you so much for stopping by! I am Min, a Registered Dietitian, a Christ follower, a wife, and a mom to our two miracle babies! Currently, I’m having a ton of fun feeding their tummies and sharing our baby led weaning journey! Follow me on Instagram if interested in seeing daily menu as well as tips and tricks.

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Recipe Rating




18 Comments

  1. 5 stars
    Thank you for this tasty recipe! Best pick me up post bed time. I used oat flour and topped with dark chocolate chips. This will be my go to in the future for sure!

    1. Aww! Don’t you just love that time to recharge? I’m thrilled that this easy cake made it even sweeter :).

  2. 5 stars
    This was great! I really enjoyed it and so did my one and a half year old and four year old. We followed the instructions and then added some plain yogurt. I will definitely be making this a lot…so nice that you can switch up the toppings!

  3. 5 stars
    We just made it! Turned out awesome. Not chewy at all, which is my worst fear with microwaved cakes. We added cocoa powder and used blended quick cook steel oats