Sourdough Baked Oatmeal

Published: March 22, 2023 • Last Updated: March 22, 2023
Author: Laura
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Warm, hearty and deliciously comforting, oatmeal made with sourdough starter is a healthy breakfast option that’s sure to make your taste buds happy. This is a great way to use sourdough discard!

Not only is it packed with nutrients like fiber, vitamins, and minerals, but it’s also full of flavor due to the sourdough starter that gives this dish its unique twist.

Plus, you can customize it to your own tastes by adding various fruits or nuts and changing up the spices. Start your day off right with a bowl of delicious Baked Oatmeal.

Have you ever made Sourdough Cinnamon Rolls? If not, you need to!

Why You’ll Love It

  1. With just a few simple steps and ingredients, you can whip up a batch of delicious baked oatmeal in no time flat.
  2. Oatmeal made with sourdough discard is full of essential vitamins, minerals, and fiber to keep you feeling full and energized throughout the day.
  3. You can easily customize this dish by adding various fruits or nuts or changing up the spices.

Ingredients Needed

Have you ever wondered? How Do I Get My Sourdough to Rise More?

A sourdough starter is a living yeast culture made from a mixture of flour and water. It adds flavor, nutrition, and complexity to your oatmeal. Feel free to use active starter or discard in this recipe!

Eggs provide structure for the oatmeal and help it to rise. If vegan, you can substitute applesauce or mashed bananas as an egg binder.

Milk adds richness and gives the oatmeal its creamy texture. Feel free to use your favorite milk alternative if desired.

Applesauce imparts a subtle sweetness and provides moisture to the oatmeal. It can be substituted with mashed banana or pumpkin puree for flavor variations.

Coconut Oil, Avocado Oil, or Melted Butter are the ingredients that give the oatmeal its buttery flavor and golden-brown crust. Choose whichever oil or butter you prefer for baking purposes!

Baking Powder is a leavening agent helps the oats rise in the oven so they don’t turn out dense and heavy when baked.

You’ll need just a small amount of coconut sugar or maple syrup to sweeten up the oatmeal without making it too cloyingly sweet.

How to Store Baked Oatmeal

  • Storing: You can store your baked oatmeal in an airtight container in the refrigerator for up to 5 days.
  • Reheating: To reheat your baked oatmeal, simply pop it into a toaster oven for a few minutes until heated through.
  • Freezing: If you have leftovers, you can also freeze them for up to 3 months. To do this, simply place the oatmeal in an airtight freezer-safe bag or container and thaw when needed!

Variation Options for Baked Oatmeal

  • Feel free to add 1 cup of fresh or frozen fruit such as blackberries, blueberries, or raspberries. You can also add diced apples or pears.
  • You can also make pumpkin puree baked oatmeal, use pumpkin puree, and add 1-2 tablespoons of pumpkin spice.
  • To add a little more nutrition, you can add a 1/4 cup of chia seeds, pumpkin seeds, hemp hearts, or ground flax.


How do I remove phytic acid?

You can neutralize phytic acid in the oats by putting the oats, milk, and starter in a container the night before. Let it ferment on the counter or in the fridge overnight. The next morning, combine everything together with the other ingredients and bake as directed.

What is the best way to make baked oatmeal?

The best way to make baked oatmeal is to combine your dry ingredients (rolled oats, baking powder, and sweetener) with your wet ingredients (active starter, eggs or egg substitute, milk, and oil or butter). Finally, mix in any add-ins like fruit or nuts before baking in the oven until golden brown.

How long does baked oatmeal last?

Baked oatmeal will last up to 5 days stored in an airtight container at room temperature or in the refrigerator. It can also be frozen for up to 3 months.

Can I use different types of sweeteners for my oatmeal?

Yes! You can use whatever type of sweetener you prefer. Honey, maple syrup, date syrup, coconut sugar, the possibilities are endless! I often simply used mashed bananas to sweeten it naturally.

Reasons to Make Baked Oatmeal

  • Baked oatmeal is a great way to use up any extra oats or other ingredients you have lying around the kitchen.
  • Enjoy a delicious make-ahead breakfast that can be enjoyed all week long.
  • You can customize your oatmeal with different flavors and add-ins to keep it exciting.
  • It’s a nutritious and balanced meal packed with protein, fiber, healthy fats, vitamins, minerals, and antioxidants.
  • Baked oatmeal is easy to store, reheat, and freeze, making it an ideal meal for busy mornings!
  • Takes only 30 minutes to prepare with minimal effort.
  • Versatile and convenient option that can be eaten hot or cold as breakfast or snack.
  • Satisfy sweet tooth cravings with mix of chocolate chips, coconut flakes and more.
  • Perfect for vegan diets with replacements like applesauce and nut milks available.
  • Heart healthy meal thanks to its combination of carbohydrates and protein content.
  • Keeps you energized throughout the day due to its balanced nutrient profile.

Best Tips for Making Oatmeal That is Baked

Making baked oatmeal is a simple and delicious way to enjoy a nutritious breakfast. Here are some tips for perfecting your own baked oatmeal recipe:

  • Use the right type of oats for your recipe. Each type of oats (quick oats, steel cut oats, or rolled oats) can provide different textures to the finished dish, so decide which will work best for you ahead of time.
  • If using sourdough starter, dissolve it in equal parts warm water before adding it to the bowl.
  • Let the finished product cool before cutting or serving, this helps ensure that all of the liquid is absorbed into the oatmeal before eating.
  • For an extra special treat, top with yogurt or nut butter before serving!

More Sourdough Recipe

Grab your very own The Sourdough Essentials Digital Cookbook! Learning how to make a sourdough starter has never been easier.

sourdough baked oatmeal
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4.75 from 4 votes

Sourdough Baked Oatmeal

This sourdough baked oatmeal is hearty and filling. It is a great way to use sourdough discard!


  • 1/2 cup sourdough starter (discard or active)
  • 4 eggs
  • 1 cup milk dairy or non-dairy
  • 1 cup applesauce sub mashed bananas or pumpkin puree
  • 2 Tbsp coconut oil, avocado oil, or melted butter
  • 1 tsp baking powder
  • 1/2 cup coconut sugar or maple syrup
  • 2 1/2 cups rolled oats
  • 1 scoop protein powder (optional)
  • 1 cup fruit, raisins, nuts, seeds (optional)


  • Preheat the oven to 375 degrees F. Oil a 9×9 baking dish. Add all of the ingredients into a bowl, except for the oats, and stir until well combined.
  • Add the oats and any fruit and fold it into the mixture. Pour the batter into the baking dish and bake for 30-40 minutes. Let cool for 10 minutes before serving.


  • To reduce the phytic acid in the oats, the starter, milk and oats can be mixed the night before and left to ferment on the counter or in the fridge until morning. In the morning, combine with the rest of the ingredients and bake as directed.

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Recipe Rating

  1. 5 stars
    I’ve been making this once a week this winter and it is so delicious! I throw everything minus the fruit to long ferment overnight in the fridge and bake in the am. I’m at altitude so another 20 minutes is needed. Thank you for this wonderful recipe!! Our favorite combo so far is blueberry almond and chocolate chip walnut!

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  2. 4 stars
    I substituted banana for the applesauce and added 1-1/2 tsp cinnamon and about the same amount of salt. I also added a few chocolate chips and the protein. I ran out of coconut sugar so I used half the amount of regular sugar. Great recipe and have saved it for the future.

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  3. This recipe is delicious! I love it with chocolate chips and might try adding some peanut butter next time I make it 🙂 It’s been a go-to for me as a make ahead breakfast for myself and our daughter as well as a midnight snack while breastfeeding our newborn!

  4. 5 stars
    I’ve been making this recipe for almost 2 months. My husband and daughter (21) give it 2 thumbs 👍🏻 up! I make it with whatever I have on hand. Banana or pumpkin, any berry-even frozen, protein powder, cinnamon or pumpkin pie spice and vanilla. Top with homemade yogurt or cottage cheese. It’s so versatile and really holds you till lunch!