These Cinnamon Oatmeal Muffins are simple, delicious, and the perfect treat! They are full of hearty oats and cinnamon flavours.

These cinnamon oatmeal muffins are so delicious. There's something about cinnamon oatmeal combined that makes me feel so cozy and warm inside.
The muffins come together in a few easy steps with simple ingredients. Let's get to baking!
Ingredients Notes
Here are a few key ingredient notes about these muffins. For the full detailed step-by-step with measurements, continue scrolling to the recipe card below.
- All-purpose flour – This flour is used for the muffins.
- Brown sugar – I used dark brown sugar, but light brown sugar works as well!
- Cornstarch – Used to enhance the texture. Optional, but recommended.
- Cinnamon - Adds a lot of depth to the flavour!
- Eggs – These should be at room temperature before beginning
- Oil – I used a flavourless oil. You can use any sort of oil, but the flavoured ones will slightly change the taste of it.
- Oats - Make sure to use rolled oats, also known as large flake oats. Quick oats will not work for this recipe!
- Sour Cream – This helps make the muffins incredibly moist.
Step by step instructions
Here is how to make and bake these Cinnamon Oatmeal Muffins. You will need a 12 muffin tin, muffin liners, 2 large mixing bowls, a spatula, and a whisk.
Step 1 – Prep. Line your muffin tin with 12 liners and set aside. If you need a recommendation, this is my favourite tin.
Step 2 – Mix together dry ingredients. In a medium-sized bowl, add all of the dry ingredients. With a spatula, stir to combine and then set aside.
Step 3 – Whisk wet ingredients. In a large bowl, whisk all of the wet ingredients; oil, eggs, milk, vanilla, sour cream, and brown sugar. Whisk them all together until well combined, 2-3 minutes.
Step 4 - Combine dry and wet ingredients. Add the dry into the wet ingredients. With a spatula, gently fold until a soft batter forms.
Step 5 – Scoop. Evenly divide the batter between 12 liners, they should all the way full. I like to use a cookie scooper to help get even scoops of batter and minimize the mess. Then, in a small glass, mix together cinnamon and sugar. Sprinkle a bit on top of each muffin. This will give you a sweet muffin dome.
Step 6 – Bake. Bake the muffins at 425°F for 5 minutes, then lower the oven to 375°F and continue to bake for 15-20 minutes. The muffins are ready when they bounce back at touch or a toothpick inserted comes out clean.
These muffins are best served fresh or next day. They stay fresh 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
- Use a gram scale. You can toggle between cups and metrics in the recipe card. This is the one I use.
- Do not over-mix! A big reason muffins don’t turn out is because the batter is over-mixed. Once you see no flour streaks, stop mixing.
- Use large-flake oats. Sometimes also called rolled oats.
- These muffins are not sweet. This is more of a breakfast style muffin. If you are looking to sweeten them up, add 1/4 cup (50g) more of brown sugar.
FAQ
Do I have to add sour cream?
Yes! This is one of the main ingredients in this recipe. It's what makes the muffins so soft and moist. You can substitute the sour cream for room temperature full-fat yogurt or buttermilk.
Do I have to add oats?
Yes! This is an oatmeal muffin recipe.
Can I add some chocolate chips?
Feel free to add in 1/2 cup of any of your favourite add-ins. I think these muffins would taste so good with some chopped pecans or chocolate chips.
PS : If you enjoyed this recipe, please make sure to leave a STAR REVIEW down below! I'd love to stay connected on Instagram @taffeybakery! To get more recipes follow me on TikTok @taffeybakery!
Cinnamon Oatmeal Muffins
Ingredients
For the muffins
- 1 1/2 cups all-purpose flour
- 1 1/4 cups rolled oats or large flake oats
- 1 tsp baking soda
- 1 1/2 tsp baking powder
- 1 tbsp cornstarch
- 1/4 tsp salt
- 2 tsp cinnamon
- 1/8 tsp nutmeg optional
- 1/8 tsp cloves optional
- 3/4 cups dark brown sugar*
- 1 tbsp vanilla
- 1/2 cup oil
- 2 large eggs room temperature
- 3/4 cups full-fat sour cream room temperature
- 1/2 cup milk room temperature
For the sprinkle
- 1/4 tsp cinnamon
- 2 tbsp white sugar
Instructions
- Preheat oven to 425℉/218℃. Line your muffin tin with 12 liners and set aside.
- In a medium-sized bowl, add in the dry ingredients. Using a spatula, mix until combined. Set aside.1 1/2 cups all-purpose flour, 1 1/4 cups rolled oats, 1 tsp baking soda, 1 1/2 tsp baking powder, 1 tbsp cornstarch, 1/4 tsp salt, 2 tsp cinnamon, 1/8 tsp nutmeg, 1/8 tsp cloves
- In another large bowl, whisk in the wet ingredients. Whisk until well combined.3/4 cups dark brown sugar*, 1 tbsp vanilla, 1/2 cup oil, 2 large eggs, 3/4 cups full-fat sour cream, 1/2 cup milk
- Add the dry into the wet and with a spatula, gently mix together 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. In a small glass, mix together cinnamon and sugar. Then sprinkle a bit on top of each muffin.1/4 tsp cinnamon, 2 tbsp white sugar
- Bake the muffins at 425℉ for 5 minutes, then lower the oven to 375°F (don't open the oven door) and continue baking for 15-20 minutes. The muffins are ready when a toothpick inserted comes out clean.
- These muffins stay fresh at room temperature for up to 3 days, and in an airtight container in the refrigerator for up to a week!
John says
Zero grams of oats doesn't sound very oaty to me!
Ania says
Hey John! My apologies about that mistake. It's been updated - 100g 🙂 Enjoy the muffins.
Brittany says
My family loved this!
Ania says
I’m so glad to hear this!! Thanks Brittany!!
Jaclyn says
How necessary is the cornstarch? I have everything needed to make these except that and I'm wondering how it will turn out without it. 🤔
Ania says
The muffins should work without it, the cornstarch adds more texture to the muffins though! Let me know how it goes 😊
Jacquelyn says
I just made these today with mods to make them dairy-free and vegan. I made the following substitutions: oat milk, Tofutti brand sour cream, and flax eggs. I also did not do the topping (I always find they make it stickier and messy for little hands ;).
The verdict: they are moist and delicious and have received 2 thumbs up from my family!
Thank you for sharing - these will be added to my regular rotation!! 🫶🏻
Ania says
Hi Jacquelyn! Thanks for your comment, I'm so happy to hear these muffins were a success dairy-free & vegan, and that they will stay in your rotation! Happy baking 🫶🏻
Doreen Jurewicz says
Can these be made in the microwave
Ania says
Hi Doreen! You have to bake these in an oven.