Making an oatmeal mug muffin couldn’t be easier!  Use a packet of instant oats to make a muffin in 2 minutes. This is the best way to make a delicious hot breakfast in no time. It’s vegan, soy-free, and easily made gluten-free too!

A mug muffin with coffee and berries.

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Why make oatmeal mug muffins

Your kids will love these!  I have seen recipes for mug cakes and tried a few of the recipes that I found.  It was amazing to see that you could actually bake in the microwave.  Who knew?

One morning, I was heating up some instant oats for my son, and I got the idea to thicken it up a little and turn it into an oatmeal mug muffin.  After some adjustments with the ingredients and some cooking times, they finally came out perfect.  Now my family can have warm muffins for breakfast without having to bake a whole batch!

Ingredients and substitutions

  • Instant Oatmeal – these are the premeasured packets of oatmeal that you just need to add hot water to cook them
  • Flour – you can use white flour, whole wheat, or my gluten-free flour mix made with oat flour.
  • Brown Sugar – any sweetener that you want will work. If you use a liquid sweetener, reduce the water slightly.
  • Oil – any neutral flavored oil will work or you can omit it for an oil-free muffin.
  • Baking Powder – to make them rise like a muffin.
  • Water – for the right moisture content.

How to make an oatmeal mug muffin

  1. Pour an instant oatmeal packet into a mug.
  2. Add flour (GF if necessary), sugar (optional), oil, baking powder, and water.
  3. Stir with a fork until a thick batter forms.
  4. Microwave on high for 2 minutes.
Instant oatmeal being poured into a mug to make a mug muffin.

Pro Tip

You can even make up little baggies with the extra dry ingredients in them so all you need to do in the morning is pour in the dry ingredients, add water, and heat for 2 minutes.  Take them with you to the office and eat a hot breakfast at your desk.  They work great for a hot after-school snack too!

How to make them gluten-free?

Yes, it’s easy to make them gluten-free, simply use gluten-free flour and oatmeal.  Any of the gluten-free flour mixes work well for this recipe, and since it is in a mug, it doesn’t matter if it is a little crumbly.  If you need them to be 100% gluten-free, make sure to use gluten-free instant oats. 

Note: Regular oatmeal can contain traces of gluten.

An oatmeal mug muffin with a fork taking a piece out of it.

How to make the muffins healthier

If you want this recipe to be healthier, leave out the sugar and/or the oil.  The mug muffin comes out well without them too.  You can stir in some flax meal too for some extra nutrients!

Add-ins for your mug muffins

Throw in a tablespoon of chocolate chips, nuts, raisins, or blueberries for a twist.  Apple cinnamon works well in this recipe with little chunks of oatmeal in the muffin.  Try experimenting with different flavors of oatmeal. Let me know which flavor you like best!

A vegan mug muffin on a breakfast tray with coffee and fruit.

If you love oatmeal like we do be sure to try my vegan oatmeal cookies, vegan baked oats with apples, or my easy blender oatmeal cups.

More muffin recipes

Oatmeal mug muffin recipe

An oatmeal mug muffing being eaten with a fork.
4.82 from 11 rating

Oatmeal Mug Muffin

The quickest and easiest way to make a gluten-free vegan muffin!  

Ingredients

  • 1 packet instant oatmeal, (any flavor)
  • 2 tbsp flour, gluten free or regular
  • 1 tsp brown sugar, (optional)
  • 1/8 tsp baking powder
  • 1 tsp canola oil
  • 1/4 cup water

Instructions
 

  • Put all ingredients into a microwave safe mug.
  • Stir with a fork.
  • Microwave on high for 2 minutes.

Notes

  • To make this muffin healthier you can leave out the extra sugar and oil.
  • Sugar levels vary between brands of instant oatmeal.
  • Toss in 1 tbsp. of your choice of berries or raisins for more flavor.
  • If you need it to be 100% gluten-free, make sure to buy gluten-free instant oatmeal.
Serving: 1muffin, Calories: 257kcal, Carbohydrates: 42g, Protein: 8g, Fat: 7g, Sodium: 6mg, Potassium: 206mg, Fiber: 4g, Sugar: 3g, Calcium: 48mg, Iron: 2.4mg
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