These Banana Oatmeal Muffins make for the perfect breakfast or on-the-go snack. They are soft, fluffy, and full of hearty oats and sweet bananas in each bite! You will love these muffins.

I love the combination of bananas and oats! After making my Banana Oatmeal Cookies, I knew I had to make some muffins soon.
These muffins are full of banana and oat flavours. All you need are a few simple ingredients, a spatula, 2 bowls, and a whisk. No electric mixers required!
For more muffin recipes, try Chocolate Chip Streusel Muffins, Pecan Banana Muffins, and Double Chocolate Muffins.
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Why this recipe works
- Easy to make - All of the ingredients are simple and no electric mixer required!
- Banana and oat flavours - Such a good and underrated combo!
- Delicious - These muffins taste so dang good!
Ingredients Notes
Full recipe and ingredients are in the recipe card below. Feel free to scroll through this section to view certain key ingredients we’re using!
All-purpose flour – This flour is used for the muffins and cannot be substituted for any other.
Bananas – 2 large bananas are used. If using frozen bananas, thaw and drain any excess liquid before adding into the bowl.
Brown sugar – I used dark brown sugar, but light brown sugar works as well!
Cornstarch – Used to enhance the texture.
Cinnamon - Adds some depth to the flavour!
Eggs – Must be at room temperature before starting your bake.
Oil – I used a flavourless oil. You can use any type of oil, but flavoured ones will slightly change the taste.
Oats - Make sure to use rolled oats, also known as large flake oats. Quick oats will not work for this recipe!
Sour Cream – The secret ingredient that makes these muffins so soft and moist! This also stabilizes the muffins and brings out soo much texture.

Step by step instructions
Here is how to make and bake these Banana Oatmeal Muffins. You will need a 12 muffin tin, muffin liners, 2 large mixing bowls, a spatula, and a whisk.
Step 1 – Prep. Line 2 muffin liners with 12 liners and set aside. If you need a recommendation, this is my favourite tin. Mash bananas in a large bowl.
Step 2 – Mix together dry ingredients. In a medium-sized bowl, add in flour, cinnamon, oats, salt, cornstarch, baking powder, and baking soda. Using a spatula, mix until just completely combined.
Step 3 – Whisk wet ingredients. In a large bowl, whisk mashed bananas, oil, eggs, vanilla, sour cream, and brown sugar. Whisk until well combined. There may be lumps from the bananas but that is okay.


Step 4 - Combine dry and wet ingredients. Add the dry into the wet and using a spatula, gently fold until a soft batter forms.


Step 5 – Scoop. Evenly divide the batter between 12 liners, they should be almost or all the way full. Using a cookie scooper helps big time to minimize the mess. Sprinkle some white sugar on top.


Step 6 – Bake. Bake the muffins at 375°F for 20-25 minutes. The muffins are ready when a toothpick inserted comes out dry with no wet batter.
These muffins stay fresh covered at room temperature for up to 3 days, and in an airtight container in the refrigerator for up to a week!

Expert Baking Tips
Here are a few expert baking tips from my kitchen to yours
- Strain off excess liquid. As bananas thaw, they let out a lot of liquid. This must be strained and removed before using the thawed bananas. If you add the liquid, it will ruin the muffin batter. I recommend draining the excess liquid before mashing and measuring out your bananas.
- Use a gram scale. I cannot emphasize this enough! It is the most accurate way of measuring your ingredients in the kitchen. This is one of my favourites.
- Do not over-mix! A big reason muffins don’t rise or turn out tough is because the batter is over-mixed. Once you see no flour streaks, stop mixing.
- The riper the banana, the better. You want to use bananas that are brown, spotty, and super-ripe. This will give you that sweetness!
FAQ
Can I use frozen bananas?
Yes! But you must strain the liquid out of the bananas. As bananas thaw, they let out a lot of liquid. Make sure there is no extra liquid before mashing and measuring out your bananas.
Do I have to add sour cream?
Yes! This is one of the main ingredients in this recipe. If you are looking for a different banana muffin recipe with yogurt or kefir instead, try My Favourite Banana Muffins.
Do I have to add oats?
Yes! This is a Banana Oatmeal muffin recipe. For regular banana muffins, try My Favourite Banana Muffins.

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Banana Oatmeal Muffins
Ingredients
- 1 1/2 cups all-purpose flour
- 1 cup rolled oats or large flake oats
- 1 tsp baking soda
- 1 1/2 tsp baking powder
- 1 1/2 tsp cinnamon
- 1 tsp cornstarch
- 1/4 tsp salt
- 3/4 cups dark brown sugar or light brown sugar
- 1 tbsp vanilla
- 1/2 cup oil any flavourless oil works
- 1/2 cup sour cream room temperature
- 2 eggs room temperature
- 1 1/4 cups bananas mashed, approx 2 large bananas
- white sugar for sprinkling
Instructions
- Preheat the oven to 375℉. Line a muffin liner with 12 liners and set aside. Mash bananas in a large bowl.
- In a medium-sized bowl, add in flour, cinnamon, oats, salt, cornstarch, baking powder, and baking soda. Using a spatula, mix until just completely combined.1 1/2 cups all-purpose flour, 1 cup rolled oats, 1 tsp baking soda, 1 1/2 tsp baking powder, 1 1/2 tsp cinnamon, 1/4 tsp salt, 1 tsp cornstarch
- In a large bowl, whisk mashed bananas, oil, eggs, vanilla, sour cream, and dark brown sugar. Whisk until well combined. There may be lumps from the bananas but that is okay.3/4 cups dark brown sugar, 1 tbsp vanilla, 1/2 cup oil, 2 eggs, 1 1/4 cups bananas, 1/2 cup sour cream
- Add the dry into the wet and using a spatula, gently fold until a soft batter forms.
- Evenly divide the batter between 12 liners, they should be almost or all the way full. Using a cookie scooper helps big time to minimize the mess. Sprinkle some white sugar on top.white sugar for sprinkling
- Bake the muffins at 375°F for 20-25 minutes. The muffins are ready when a toothpick inserted comes out clean.
Gilbert Hudson Solis says
Absolutely delicious. Definitely my favorite banana oat recipe yet.
Ania says
Hi Gilbert! Amazing to hear - thanks for sharing, it made my day 🙂 Enjoy!
Kalliste says
Perfect way to use up some bananas. I used greek yoghurt instead of sour cream (because that's what I had), and decreased the sugar quite a lot because I was looking for a healthier snack. As expected, it wasn't as sweet as it could have been, but still tasty!
I did two batches because my muffin tin is a 6 tin and found that the second, rested batch rose more. So, I'd probably rest the whole thing in the future.
Ania says
Amazing!!! Interesting how the second batch rose more, I found mine stayed the same. I had a 12 muffin tin so I baked mine right away..baking is such a science haha! Thank you for your comment!