Slow Cooker Oatmeal

By: Shannon Epstein

Slow cooker traditional oatmeal recipe is a fuss-free way to start your day healthy. Here I will show you how to make oatmeal overnight in the slow cooker or in just 4 minutes in the Instant Pot.

Easy Slow Cooker Oatmeal (Vegan)

Ingredients For Oatmeal

There are only 5 ingredients in this easy slow cooker oatmeal recipe. 

  1. Oats: This recipe calls for steel-cut oats, not quick or instant. 
  2. Milk Of Your Choice: Grab the milk of your choice! For this to be vegan, use a nut milk like almond milk.
  3. Maple Syrup: You don’t have to use a sweetener but it definitely ads to the taste. I like to use maple syrup because I don’t like sugar. Honey is another option but it’s not vegan. 
  4. Vanilla
  5. Cinnamon 
steel cut oats in a white bowl
steel cut oats

How To Make Traditional Oatmeal In The Slow Cooker

Making oatmeal is very easy, especially when you use the slow cooker or Instant Pot. 

Slow Cooker

  1. Spray slow cooker generously with cooking spray.
  2. Add all ingredients to the slow cooker. Stir to mix well.
  3. Cook HIGH 3-4 hours or LOW 6-8 hours.
  4. Stir well before serving.

Instant Pot

  1. Spray the Instant Pot generously with cooking spray.
  2. Add all the ingredients. Stir gently to mix well.
  3. Close lid and seal valve. Set high pressure for 4 minutes. When cooking time is complete, let the pressure release naturally before opening.
  4. Stir well before serving.
overhead shot of uncooked oatmeal in the slow cooker
before

What Is Oatmeal

Oatmeal is a term used to describe a porridge made from ground, steel cut, or rolled oats. Each of these terms just means that the oat has been removed from a husk and is ready to cook! Oatmeal may also be called hot cereal, which also covers cream of wheat and grits, but we are just going to focus on making oatmeal today.

Most people are familiar with the quick oatmeal that you can get in many flavors and from many brands at your local grocery store, but what many people don’t know is how cheap and easy it is to make your own oatmeal at home. When you make oatmeal at home, you can add a variety of healthy ingredients to it like fruits and nuts to increase the benefits you get from your morning meal! Oatmeal is a whole grain, too, so you can feel better about making it for your children over sugar filled breakfast cereal.

overhead shot of cooked oatmeal in the slow cooker
after (cooled & thickened)

Steel Cut or Rolled Oats?

Slow Cooker or Instant Pot oatmeal is best made with steel-cut oats. Steel cut oats are one of the healthiest grains; they’re minimally processed, and contain more fiber than rolled oats. Personally I always use steel-cut oats for my oatmeal and rolled oats for baking or making oat flour. If you’re using the slow cooker and intend for this to be an overnight oatmeal recipe, you cannot use rolled oats, they will turn to mush during the long cook time.

Having said that, yes you can use rolled oat if you must but you will need to make adjustments. For the slow cooker, the cook time will be 1-2 hours on high or 2-4 hours on low. For the pressure cooker, the cook time remains the same but you have to change the oat/liquid ratio.

Liquid/Oatmeal ratio for slow cooker or Instant Pot:
Steel cut – 3 cups liquid to 1 cup oats
Rolled – 2 cups liquid to 1 cup oats

This recipe does not work with instant oatmeal.

close up of cooked oatmeal in a bowl topped with nuts and raisins

Water or Milk?

For the liquid in this oatmeal, you can use the milk/water ratio I list in the recipe card or you can use all water or 3 cups of your preferred milk. Milk will make the oatmeal creamier than plain water. For this recipe to be vegan, you have to use either water or something like a nut milk or coconut milk. Personally I use almond milk. For the sweetener, in order for this to be a vegan oatmeal recipe, you will need to use maple syrup or sugar. The measurements and cook time will remain the same regardless of which sweetener you decide to use.

close up of cooked oatmeal in a bowl topped with nuts and raisins

Doubling The Recipe

Need to cook slow cooker traditional oatmeal for a larger crowd? You can double or triple the recipe without having to make adjustments to the cook time. The oatmeal will still cook for 8 hours or 4 minutes (slow cooker vs pressure cooker), you will just need a larger appliance.

Storing Leftover Oatmeal

Refrigerate your cooked oatmeal for 5-7 days. To reheat the oatmeal, add some milk or water, before heating in the microwave or on the stove top.

Easy Slow Cooker Oatmeal (Vegan)

FAQs & Tips 

  • It’s important to spray the slow cooker or Instant Pot with cooking spray to help keep the oatmeal from sticking. The oatmeal will still probably stick to the sides a bit but it won’t be nearly as bad as it would if you didn’t spray.
  • Top your oatmeal with your preferred toppings. Suggestions include additional sweetener, chopped nuts, fruit, granola, etc.
  • Oatmeal is a recipe that can be tailored to your taste buds. If you like oatmeal sweet, use more sweetener. Do you like your oatmeal thick or thin? If thin, add more liquid. If thick, use less. Please note that the oatmeal will thicken as it cools.

Oatmeal Recipes

I used a 2.5-quart slow cooker for this recipe. 

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Easy Slow Cooker Oatmeal

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5 from 3 reviews

Slow cooker traditional oatmeal recipe is a fuss-free way to start your day healthy. Here I will show you how to make oatmeal overnight in the slow cooker or in just 4 minutes in the Instant Pot.

  • Author: Shannon Epstein
  • Prep Time: 5 minutes
  • Cook Time: 4 hours
  • Total Time: 4 hours 5 minutes
  • Yield: 4 servings 1x

Ingredients

Units Scale
  • 1 cup steel-cut oats
  • 2 cups milk of your choice (I use almond milk)
  • 1 cup water
  • 2 tablespoons maple syrup (or sweetener of your choice)
  • 1/2 teaspoon vanilla extract
  • 1/2 teaspoon cinnamon (optional)

Instructions

Slow Cooker

  1. Spray slow cooker generously with cooking spray.
  2. Add all ingredients to the slow cooker. Stir to mix well.
  3. Cook HIGH 3-4 hours or LOW 6-8 hours.
  4. Stir well before serving.

Instant Pot

  1. Spray the Instant Pot generously with cooking spray.
  2. Add all the ingredients. Stir gently to mix well.
  3. Close lid and seal valve. Set high pressure for 4 minutes. When cooking time is complete, let the pressure release naturally before opening.
  4. Stir well before serving.

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Meet The Author

Hi, I’m a home cook from Los Angeles. I received a slow cooker as a wedding gift in 2011, but it wasn’t until six months later, facing my highest weight and hypertension, that I started using it. Follow me to learn more about my journey to healthier living and discover delicious recipes along the way.

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5 thoughts on “Slow Cooker Oatmeal”

  1. I’m trying to get as much protein as possible.
    Would it be possible to use higher protein rolled oats in this recipe and just cut the cooking time in half?

    1. Hmmm. I have not tried this recipe using higher protein rolled oats but I have with regular rolled oats. Regular rolled oats took about half the time so I would imagine it would work with a high protein version but unfortunately I cannot say for sure. I’m sorry, this is probably not the answer you’re looking for! If you try it, let me know how it works out!

  2. I just tried your recipe exactly as written. Delicious! Consistency and taste were excellent. Thank you.

  3. I love oatmeal for breakfast, and this recipe looks AWESOME! Good morning to me!

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