Oatmeal Smoothie

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This Oatmeal Smoothie is the perfect breakfast or snack, when you need a something that will keep you feeling full. It’s inspired by my Peanut Butter Overnight Oats, only you can drink this version with a straw!

oatmeal smoothie on wood board

What You Need to Know

Can you put raw oats in a smoothie? Yes! Uncooked oats actually have more resistant starch than cooked oats, and resistant starch may help to feed the friendly bacteria in your gut.

What type of oatmeal is best for a smoothie? Since you don’t want to sip a big chunk of oatmeal through your straw, I think old-fashioned rolled oats or quick-cooking oats are best in a smoothie.

If you don’t have a powerful blender, I recommend blending the oats first, so they are already ground before you add in the rest of your smoothie ingredients.

Steel cuts oats could work if you grind them in a high-speed blender first, too, but it’s more of a risk that your smoothie won’t be perfectly creamy.

Benefits of Oats

Why would you want to add oatmeal to a smoothie? Oats have some impressive nutrition inside!

Here’s why you’ll love them:

Looking for more ways to sneak oats into your day? Try my Pumpkin Baked Oatmeal, Chocolate Overnight Oats, or my other oat flour recipes for more ideas.

How to Make It

To make this Oatmeal Smoothie, I like to start by briefly grinding the oats.

rolled oats ground in blender

This will ensure you don’t get any chunks of oats through your straw later, but you can skip this extra step if you have a high-speed blender that you know will pulverize everything, regardless.

oatmeal smoothie blended together

Now that the oatmeal is ground, add in the liquid, peanut butter, frozen banana (here’s how to freeze bananas), ground flax seeds, and maple syrup, if you’d like a little extra sweetness.

Want to add spinach? You can add that when you add the peanut butter and bananas, too. The smoothie will just look green in that case!

Blend until smooth, then add in a handful of ice cubes, to give this smoothie a slushy texture.

ice added to blender

The more ice you add, the more diluted the flavor will be, so I think 3 to 5 cubes is plenty.

slushy smoothie poured into glass

Enjoy right away for the best taste and texture. Oatmeal tends to thicken as it sits in liquid, so if you need to add an extra splash of water or milk to your drink, you can do that as you sip!


Need to try something different? Here are some other ideas that might work.

Banana. You can replace the banana with frozen avocado for creaminess, but it will be less sweet in that case. Try adding 1-2 dates, or a squeeze of honey or maple syrup, if you’d like to make it sweeter in that case.

Almond milk. You can try another dairy-free milk like oat milk or hemp milk, or just use plain water instead! Dairy may inhibit the absorption of antioxidants in the body, so that’s why I don’t use it in my smoothies.

Peanut Butter. I love the flavor peanut butter adds here, but you can use almond butter or sunflower seed butter to add creaminess, too.

Flax seeds. These seeds add omega-3 fatty acids to the smoothie and help keep you feeling full, but you can also try chia seeds instead, or just leave them out.

slushy smoothie on spoon
oatmeal smoothie on wood board
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5 from 16 votes

Oatmeal Smoothie

This Oatmeal Smoothie tastes like a batch of peanut butter oatmeal, only you can drink it with a straw! It's creamy and filling, and takes just minutes to make.
Course Breakfast
Cuisine gluten-free
Keyword oatmeal smoothie
Prep Time 5 minutes
Cook Time 0 minutes
Total Time 5 minutes
Servings 1
Calories 461kcal



  • 1/4 cup rolled oats (27 grams)
  • 1 frozen banana (sliced into coins; 99 grams)
  • 2 tablespoons peanut butter (40 grams)
  • 1 tablespoon ground flax seeds (6 grams)
  • 3/4 cup almond milk or water (6 ounces)
  • .5 to 1 tablespoon maple syrup (10 grams; or to taste)
  • 3 to 5 ice cubes


  • In a high-speed blender, add the oats and blend briefly to break them down into smaller pieces. This will prevent you from finding any big chunks of oatmeal in your smoothie later.
    rolled oats ground in blender
  • Add in the banana, peanut butter, flax, liquid, and maple syrup, if desired, then blend until smooth.
    oatmeal smoothie blended together
  • Add in the ice cubes and blend again, until the smoothie has a slushy texture.
    ice added to blender
  • Serve right away for the best taste and texture.
    slushy smoothie poured into glass



Nutrition information is for the whole batch, using 1/2 tablespoon of maple syrup. This is just an estimate, and not a guarantee.
See the full post for substitution ideas.


Calories: 461kcal | Carbohydrates: 56g | Protein: 14g | Fat: 23g | Saturated Fat: 4g | Sodium: 398mg | Potassium: 783mg | Fiber: 10g | Sugar: 24g | Vitamin A: 76IU | Vitamin C: 10mg | Calcium: 285mg | Iron: 2mg

More Smoothie Recipes

Looking for more smoothie inspiration? Try one of these!

If you try this Oatmeal Smoothie, please leave a comment below letting me know how you like it! And if you make any modifications, I’d love to hear about those, too.

Reader Feedback: What’s your favorite smoothie combination?

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Soooo creamy and delicious. The hints of peanut butter with the oats is SPOT ON! Love your recipes and have yet to make one I haven’t loved!


This was like an oatmeal cookie! Very tasty and satisfied my hungry sweet tooth. I added a handful of fresh spinach after tasting and blended again so mine was a “green oatmeal cookie”. 😋 The fresh spinach didn’t change the flavor at all!

Alex Larson

Such a great smoothie! I added some peanut butter collagen peptide mix in and it was a perfect fit!

Anita sanda

WOW! This is so good! I’m going to be addicted!


I made this for breakfast today. I used oatmeal, flax, almond milk and some frozen watermelon and threw in my usual sprinkles of cinnamon, ginger, and turmeric. It was creamy and good. My digestive tract does not like it when I eat the overnight raw oats but so far the smoothie seems okay. And it was very filling.


So smooth and delicious! I added a couple tbsp of collagen as well for a little added protein and it worked out great!


I made this with a nonfrozen banana because that was all I had. It wasn’t as frozen but the
taste was still really good. I will be making this again and again.

Christa Hines

I was skeptical about an oatmeal smoothie, but I’m glad I tried it. This is delicious option for busy mornings, and I love that it keeps me feeling full longer than a traditional smoothie. Even my picky teen loves it!


This has become a regular breakfast smoothie in our house!

Jimeen Jackson

AMAZING!!! I have made this smoothie twice so far and it keeps getting better and better!!!


Looks delicious! Is this properly combined or would I need to leave out the banana and nut butter?


Very tasty. I reduced the peanut butter to 1 tablespoon and the banana to 1/2 to reduce calories and added in a handful of spinach. Yum.


This was absolutely delicious. I added a handful of frozen strawberries that were left in my freezer from the summer and it was like drinking a peanut butter and jelly ice cream shake. So good I’ll have to make myself another one for tomorrow morning. Also, I used organic home style instant oats and it worked great. If the old fashioned is better in some way, please let me know and I’ll definitely add that to my pantry.


I love that I always have the ingredients to make this smoothie. It’s so filling and delicious!

Justine Rivera

This has become my favorite smoothie that I have almost daily! It’s filling and makes me feel healthy just drinking it but it’s also super delicious. Very few recipes you can say that about!

I have made it enough times to be able to play with different substitutes and modifications. Here are some of them:

-Oat milk goes fantastic in this. I’ve been using Oatly’s Full Fat oat milk for that creamy texture.

-Non frozen bananas are okay you just might need to up the ice content but this could lead to a “looser” or more watery smoothie. I recommend putting in the recommended amount of ice cubes first then putting in one ice cube at a time until you get your desired consistency. Careful not to overblend as some blenders actually add heat from friction to the overall smoothie.

-Baby spinach is a great addition! Blueberries too!

-Turmeric blends nicely into this as well with no staining. I have also added walnuts and Hemp seed too. I once added dates as a substitute for maple syrup and it was yummy!

-Almond butter is a nice dynamic replacement for peanut butter and complements the warm flavor of the ground flax seed well.

-If you’re using a vitamin or equivalent blender, I personally have just been adding all of the ingredients at once out of convenience and it turns out just fine. But again I’ve made this probably a hundred times now so I’ve gotten to really know the recipe and my blender well.

Hope this helps!


I find myself coming back to this recipe again and again! It’s soo delicious and such a quick and filling breakfast. My toddler really loves it too. Highly recommend!


Loved it. Tastes get. I love that oats are a super food.

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