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Soaked Oatmeal Smoothie

I love oatmeal. I could eat it almost everyday, but I tend to shy away from it in the summer in favor of foods that don’t make me want to sweat first thing in the morning. That is until I discovered that I could put oats in a smoothie without them tasting “grainy.” It does require one step in advance, but that is no problem if you’re making them on a batch cooking day. Not only does soaking the oatmeal soften it up, but it also begins to break down parts of the grain that can be difficult to digest (Kitchen Stewardship has more information on the science behind this). Yet another benefit, all of the variations of this recipe will give you that sticks-to-your-ribs type of breakfast without eating hot cereal.

Fall Flavors soaked oatmeal smoothie.

Between eating with the seasons and my love of variety and creativity in the kitchen, I’ve come up with several great combinations. You will always start with the oats, buttermilk, and frozen banana. Then plug in whatever fruit, liquid, and add ins you need for your desired flavor, or create your own.

Favorite combinations:

  • PB & J — frozen strawberry, apple juice, and peanut butter {my all-time favorite, pictured here}
  • Peaches & Cream — frozen peaches, milk, and wheat germ
  • Banana Berry — blueberries, apple juice, and ground flax seed
  • Lots of Berries — mixed berries and cranberry juice
  • Fall Flavors – pumpkin puree (substitute 1/4-1/3 cup for banana), diced apples, cranberry juice, 1/2 tsp. pumpkin pie spice

Peanut Butter and Jelly Soaked Oatmeal Smoothie

Fruity Soaked Oatmeal Smoothie


Kim @ onceamonthmeals.com


  • 0.25 cup rolled oats
  • 0.5 cup buttermilk
  • 1 frozen banana
  • 0.5 cup frozen fruit (berries and peaches are my favorite)
  • 0.5 cup liquid (juice, milk, or water)
  • 2 Tablespoons optional add ins (nut butter, flax seed, wheat germ, etc.)
  • ice cubes (add if your ingredients aren’t frozen)

Package fruit separately from oatmeal and buttermilk. Thaw and/or soak oatmeal on at room temperature over night and add fruit to blender frozen.


Place rolled oats and buttermilk in a small container (with a lid or covered) or freezer bag and soak at room temperature overnight. (Don’t worry, the buttermilk won’t spoil as it is cultured at room temperature and refrigerated afterward.) In the morning, place soaked oats and remaining ingredients into a blender and mix on high until smooth. Serve immediately.

Freezing Directions:

Flash freeze banana and desired fruit on a baking sheet. Place in a small freezer bag(s). Place rolled oats and buttermilk in separate small freezer bag(s). Freeze along with bag(s) of fruit. To serve, thaw bag of oats at room temperature overnight. In the morning place thawed/soaked oats, frozen fruit, and remaining ingredients into a blender and mix on high until smooth. Serve immediately.

Servings: 2

**conversion chart image provided by Erik Spiekermann

12 Responses to “Soaked Oatmeal Smoothie”

  1. Shonda says:

    Mmm, I’ll have to try this one!

  2. Andrea says:

    Instead of the buttermilk, do you think you could use the whey leftover from making yogurt? Would you still let it soak overnight on the counter?

  3. Julie says:

    Any ideas for something other than buttermilk?

    • kim says:

      You can use plain yogurt or whey. Even just warm water will work, but the cultured options work better and provide you with a nice little shot of probiotics.

  4. Mike says:

    Great ideas! Thanks for sharing! Can’t wait to make my own oatmeal smoothie!

  5. Tanya says:

    Sounds delicious! Could you use steel cut oats in place of the rolled oats?

  6. Is there something I could use instead of the banana? My husband is allergic :(

    • kim says:

      You can just add extra of whichever fruit you have chosen. I also used avocado for the first time in a smoothie a few days ago, and the texture was similar while giving it only a mild flavor.

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  8. Lindsey says:

    Do these turn out if I do the oats and milk overnight, then blend everything and freeze? I’d rather have them ready to go the morning of.

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