Blueberry Overnight Oats

These blueberry overnight oats are loaded with blueberries and topped with a crunchy, gluten-free crumble. It’s like having a dessert for breakfast, but still healthy!

Remember that time I took leftover blueberry crumble and made overnight oats out of it? Gah, it was so delicious! I would have it for breakfast every morning if I could.

Blueberry overnight oats in a white and blue bowl with oatmeal crumble and blueberries on top.

Sadly it’s not too often that I have leftover crumble or cobbler sitting around. So I decided to remedy the situation by recreating a version of blueberry overnight oats with a crumble topping that can be made any day of the week. No leftover crumble necessary.

What Are Overnight Oats?

If you’ve never made overnight oats, you might be wondering what the heck these are! Essentially, it’s a no-cook way to enjoy oatmeal. Instead of cooking oatmeal on the stovetop or in the microwave, you soak the oats in milk. Overnight, the oats absorb whatever liquid you’re using and soften them up. The next morning you will wake up to a ready-to-eat, delicious breakfast!

Blueberry overnight oats in a large mason jar with lots of blueberries on top.

Ingredients in Blueberry Overnight Oats

Here’s what you’ll need to make these blueberry overnight oats:

  • old fashioned oats – rolled oats work best for overnight oats. They soak up the liquid overnight, which gives you a lovely creamy texture. Instant, quick-cooking and steel cut oats don’t work because they don’t absorb the liquid in the same way that rolled oats do.
  • milk – I like using unsweetened vanilla almond milk, but any type of milk will work.
  • vanilla protein powder – I use a plant-based vanilla protein powder that has a hint of sweetness from the vanilla flavor. If your protein powder isn’t sweet, you’ll likely want to add a little sweetener like maple syrup to your oats.
  • fresh blueberries – a must for blueberry overnight oats!
  • chia seeds – for extra fiber, protein and healthy fats. They also soak up some of the liquid.
  • vanilla extract – you can skip this, but I love the added flavor the vanilla adds to these oats.
  • crumble topping – everyone knows the best part of any sort of crumble, cobbler or crisp is the topping — same goes for these oats! To make this crumble you just need a few ingredients: rolled oats, oat flour, coconut sugar, coconut oil, sliced almonds and cinnamon.

How Long Do Overnight Oats Need to Soak?

Given the name, you’d assume overnight oats need to soak overnight, but you can actually make them in 2-4 hours if you’re in a rush. While it does take some time for the oats to absorb the liquid, they don’t necessarily have to be soaked overnight.

I recommend at least 8 hours for true overnight oats, but there have been mornings where I decide I want overnight oats for breakfast even though I didn’t prep them the night before. When this happens I’ll make them the morning of and let the oats soak for just 2-4 hours. With this quick soak, they’re not as soft as overnight oats that have soaked longer and they’re a bit more liquidy, but they’re still delicious.

Showing ingredients for the oatmeal crumble topping in a white enamel bowl.

Can You Eat Overnight Oats Hot?

Short answer, yes! You can definitely warm up overnight oats, but the whole point of overnight oats is to eat them cold like muesli. Even if you think cold oats sound strange, I recommend giving it shot before you write them off. Of course, if you simply can’t do the cold oats you can always heat them up. Just pop the overnights oats in your microwave, cooking in 30 second increments until the oats are warm throughout and enjoy.

Blueberry overnight oats in a white bowl with blue rim. Topped with blueberries, crumble and nut butter.

How Long Do Overnight Oats Last?

When stored in an airtight container in the fridge overnight oats should last for up to 5 days. They will soften more the longer they sit so I find they’re best on days 1-3, but they’re still safe to eat on days 4 and 5. With this said, overnight oats are great for meal prep. Feel free to make a whole batch for the week on Sunday. I like prepping them in wide mouth 16 oz mason jars.

Blueberry overnight oats in a white bowl with blue rim. Topped with blueberries, crumble and nut butter.

More Blueberry Recipes to Try:

If you make this recipe:

Please leave a comment and star rating below letting us know how it turned out. Your feedback is so helpful for the EBF team and our readers! We appreciate it so much.

Blueberry overnight oats in a white bowl with blue rim. Topped with blueberries, crumble and nut butter.

Blueberry Overnight Oats

Brittany Mullins
These blueberry overnight oats are topped with a crunchy crumble. It’s like having a dessert for breakfast, but still healthy!
4.67 from 12 votes
Prep Time 10 mins
Total Time 10 mins
Course Breakfast
Cuisine American
Servings 2
Calories 336 kcal


  • 1 cup old fashioned rolled oats not instant
  • 1 1/2 cups unsweetened almond milk
  • 4 Tablespoons vanilla protein powder I use Nuzest
  • ½ cup fresh blueberries plus more for topping
  • ½ Tablespoon chia seeds
  • 1 teaspoon vanilla extract

Crumble Topping

  • 1 1/2 Tablespoons old fashioned oats
  • 1 Tablespoon oat flour
  • 1 Tablespoon coconut sugar cane sugar works too
  • ½ Tablespoon coconut oil melted
  • 1 Tablespoon sliced almonds
  • ¼ teaspoon cinnamon


  • Combine: Place all ingredients (besides those for the topping) in a container and stir until well combined. Seal with a lid and place in the fridge overnight.
  • Prepare the crumble: Combine all ingredients for crumble in a small bowl. Set aside. (This can be done the night before as well.)
  • Serve: Bring out of the fridge in the morning and stir. You’ll notice that the protein powder, oats and chia seeds soak up a lot of the liquid so you may want to add a little more almond milk before serving. Portion overnight oats into two containers, top each with the crumble topping and a few extra blueberries. I also did a drizzle of almond butter! Enjoy.



  • Crumble topping substitute: No time to make the crumble topping? Simply top the oats with granola instead.


Serving: 1gCalories: 336kcalCarbohydrates: 49gProtein: 28gFat: 12gSaturated Fat: 4gPolyunsaturated Fat: 3gCholesterol: 1mgSodium: 142mgFiber: 8gSugar: 13g
Keyword blueberry overnight oats
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More Overnight Oats Recipes:

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Recipe Rating

    1. Kaitlyn
      June 3, 2021 AT 7:38 am

      5 stars
      I came back to re make this recipe after eating it 4 days in a row. These are so delish! I made according to recipe but divided into 4 jars to have as a grab and go nursing snack. The vanilla protein in the oats gives it an awesome creamy flavor and the sweet crunchy crumble topping is the perfect add on. Can’t wait to have these again tomorrow!

      1. Brittany Mullins
        June 3, 2021 AT 9:41 am

        Ah yay! This makes me so happy to hear. I’m so glad you’ve been enjoying these overnight oats, Kaitlyn! Thanks for the review. I really appreciate it!

    2. Kim
      May 28, 2021 AT 11:37 am

      5 stars
      This was so delicious and more filling than my other overnight oats because of the Greek yogurt. I added fresh blueberries, raspberries and almonds on top for a bit of texture!

      1. Brittany Mullins
        May 28, 2021 AT 12:58 pm

        So glad you loved this recipe, Kim. Thanks for the review, I so appreciate it!

    3. Maureen Carney
      May 13, 2021 AT 8:30 pm

      5 stars
      Thanks for the Great article!
      Really good recipe.
      I’m in a weight loss FB GROUP and there’s a bunch of us
      trying this out.
      we’ve all been getting pretty good result’s as well 🙂
      Hope this can help others too.

      1. Brittany Mullins
        May 14, 2021 AT 1:46 pm

        So glad you enjoyed the overnight oats, Maureen! Thanks for coming back to leave a review. I really appreciate it 🙂

    4. Brigitte Couture
      May 13, 2021 AT 9:36 am

      Do you think it would work using barley flakes? I only have steel cut oats. Thanks!

      1. Brittany Mullins
        May 14, 2021 AT 2:24 pm

        Hey Brigitte, I’ve never tried it so I’m not sure how the recipe would turn out. Let me know if you decide to try it!

    5. Erica
      June 14, 2020 AT 7:34 pm

      5 stars
      Love your overnight oats recipes!! And this crumble is so yum!!!

      1. Susannah
        May 14, 2021 AT 12:00 pm

        5 stars
        This is the 4th EBF overnight oats recipe I’ve tried and I love them all. I can’t wait for breakfast every morning! The crumble topping is delicious.

        1. Brittany Mullins
          May 14, 2021 AT 1:56 pm

          Woo!! I’m so glad you’re enjoying these overnight oats, Susannah! Thanks for the review and star rating. It means the world to me!

      2. Brittany Mullins
        June 15, 2020 AT 12:50 am

        Ahh yay!! So glad you’re loving this overnight oats recipe, Erica. Thanks for making it and for coming back to leave a comment + star rating. I really appreciate it. 🙂

4 bowls of oatmeal topped with a variety of fruit, nuts, nut butter, chocolate chips and toppings.



Eating oatmeal doesn’t have to be boring!