Chocolate Chip Oatmeal Streusel Muffins are soft, fluffy, and full of hearty oats and gooey chocolate in each bite! They have a sugar oat streusel sprinkled on top.

This is a classic muffin that comes together with simple, everyday ingredients that you probably already have sitting in your pantry.
The muffins have a very simple buttery sugar oat streusel sprinkled on top before baking. While streusel is not necessary for the muffins, it does elevate them soo much and adds a lot of texture and flavour!
Let's get to baking!
For more muffin recipes, try Chocolate Chip Streusel Muffins, Pecan Banana Muffins, and Double Chocolate Muffins.
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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.
Brown sugar – I used light brown sugar, but dark brown sugar works as well!
Butter - This will be melted and cooled and used for the streusel.
Chocolate chips - I find mini chocolate chips work best for these muffins as they create perfect little pockets of chocolate. You can also use semi-sweet chocolate chips, but there will be more chocolate in the muffin.
Cornstarch – Used to enhance the texture.
Cinnamon - Adds a lot of 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!

Step by step instructions
Here is how to make and bake these Chocolate Chip Oatmeal Muffins. You will need a 12 muffin tin, muffin liners, 2 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 – Make the streusel. In a medium sized bowl, add flour, white sugar, brown sugar, oats, cinnamon, and melted and cooled (but still liquid) butter. Using your hands, mix this until crumbly and combined. Add an extra tbsp of flour on top to help absorb the extra butter and break the streusel into bigger and smaller pieces. Set aside while you make the muffin batter.

Step 3 – Mix together dry ingredients. In a medium-sized bowl, add in flour, oats, cinnamon, salt, cornstarch, baking powder, and baking soda. Using a spatula, mix until just completely combined.
Step 4 – Mix wet ingredients. In a large bowl add eggs, vanilla, brown sugar, oil, and sour cream. Whisk until combined.


Step 5 - Combine dry and wet ingredients. Add the dry into the wet and using a spatula, gently fold until a soft batter forms.


Step 6 - Add in chocolate chips. Mix in the mini chocolate chips until just combined. Do not over-mix!


Step 7 – Scoop. Evenly divide the batter between 12 liners. Using a cookie scooper helps big time to minimize the mess. Sprinkle a handful of streusel on top of each muffin.


Step 8 – Bake. Bake the muffins at 425℉/218℃ for 5 minutes and then 375°F for 15-20 minutes. The muffins are ready when a toothpick inserted comes out clean.
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
- 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.
- Use large-flake oats. This will give you the best texture of muffin.
FAQ
Do I have to add milk?
Yes! This is one of the main wet ingredients in this recipe. You can use dairy or non-dairy milk such as almond milk.
Do I have to add oats?
Yes! For a classic chocolate chip muffin recipe, check out The Best Chocolate Chip Muffins.
Why do you do 2 temperatures?
The first temperature is a short-term high temperature. The goal here is that the heat is so hot it activates the leavening agents so the muffins grow tall quickly within the first 5 minutes and you get that muffin dome.

Check out more oatmeal recipes
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!

Oatmeal Chocolate Chip Streusel Muffins
Ingredients
For the muffins
- 1 1/2 cups rolled oats or large flake/old-fashioned oats
- 1 3/4 cups all-purpose flour
- 1 tbsp cornstarch
- 1 tsp cinnamon
- 1 1/2 tsp baking powder
- 1 tsp baking soda
- 1/2 cup milk room temperature
- 3/4 cups full-fat sour cream room temperature
- 2/3 cups oil
- 3/4 cups light brown sugar
- 2 eggs room temperature
- 1 tbsp vanilla
- 3/4 cups mini chocolate chips
For the streusel
- 1/2 cup all-purpose flour + 1-2 extra tbsps
- 1/4 cup white sugar
- 3 tbsp dark brown sugar
- 1/3 cup rolled oats
- 1/4 tsp cinnamon
- 4 tbsp unsalted butter melted and cooled back to room temperature
Instructions
- Preheat the oven to 425℉/218℃. Line your muffin tin with 12 liners and set aside.
For the streusel
- In a medium-sized bowl, add flour, white sugar, dark brown sugar, cinnamon, rolled oats, and melted and cooled (but still liquid) butter. Using your hands, mix this until crumbly and combined. You may need to sprinkle an extra 1-2 tbsp of flour on top and continue to mix together if your butter isn't completely absorbed. Set aside while you make the muffin batter.1/2 cup all-purpose flour, 1/4 cup white sugar, 3 tbsp dark brown sugar, 1/3 cup rolled oats, 1/4 tsp cinnamon, 4 tbsp unsalted butter
For the muffins
- In a medium-sized bowl, add in flour, oats, cinnamon, salt, cornstarch, baking powder, and baking soda. Using a spatula, mix until just completely combined.1 1/2 cups rolled oats, 1 3/4 cups all-purpose flour, 1 tsp cinnamon, 1 tbsp cornstarch, 1 1/2 tsp baking powder, 1 tsp baking soda
- In a large bowl add eggs, milk, vanilla, brown sugar, oil, and sour cream. Whisk until combined.1/2 cup milk, 3/4 cups full-fat sour cream, 2/3 cups oil, 3/4 cups light brown sugar, 2 eggs, 1 tbsp vanilla
- Add the dry into the wet and using a spatula, gently fold until a soft batter forms.
- Mix in the mini chocolate chips until just combined. Do not over-mix!3/4 cups mini chocolate chips
- Evenly divide the batter between 12 liners. Using a cookie scooper helps big time to minimize the mess. Sprinkle a handful of streusel on top of each muffin.
- Bake the muffins at 425℉/218℃ for 5 minutes and then 375°F for 14-18 minutes. The muffins are ready when a toothpick inserted comes out clean.
- 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!
Anonymous says
My family loved this!
Ania says
I'm so happy to hear this, thank you!