Warm, nourishing, incredibly simple, and absolutely delicious—this baked oatmeal is everything you want in a make-ahead breakfast. The sourdough discard gives it a tender, custardy texture with just a hint of tang, turning a basic breakfast into something magical.

It’s also endlessly customizable with fruit, nuts, chocolate, spices, and more. Make it your own!

✨ Ingredients

Dry Ingredients

  • 2 cups old-fashioned rolled oats
  • 1 tsp baking powder
  • 1 ½ tsp cinnamon
  • ¼ tsp nutmeg (optional)
  • ¼ tsp salt

Wet Ingredients

  • 1 cup sourdough discard (100% hydration)
  • 1 ½ cups milk (dairy or almond/oat milk)
  • 2 large eggs
  • ⅓ cup maple syrup or honey
  • 2 tbsp melted butter or coconut oil
  • 2 tsp vanilla extract

Optional Add-Ins (choose 1–2 cups total)

  • Blueberries, raspberries, or strawberries
  • 1 diced apple (plus 1 tsp extra cinnamon)
  • Sliced bananas
  • Chopped pecans, walnuts, or almonds
  • Chocolate chips
  • Shredded coconut
  • 1 tbsp chia seeds or ground flax

Instructions

  1. Preheat your oven to 350°F (175°C).
  2. Grease an 8×8 or 9×9 baking dish.
  3. In a mixing bowl, whisk together the oats, baking powder, cinnamon, nutmeg, and salt.
  4. In a separate bowl, whisk the sourdough discard, milk, eggs, maple syrup, melted butter, and vanilla until smooth.
  5. Pour the wet ingredients into the dry ingredients and stir to combine.
  6. Gently fold in your favorite add-ins.
  7. Pour the mixture into the baking dish and smooth the top.
  8. Bake 35–45 minutes, or until the center is set and the edges are lightly golden.
  9. Cool for 10 minutes before slicing. Serve warm—and enjoy the cozy magic.

Serving Tips

  • Add a drizzle of maple syrup
  • Serve with Greek yogurt
  • Top with berries or banana slices
  • Warm it up with a splash of milk

Storage

This is a dream for meal prep!

  • Refrigerator: 5 days
  • Freezer: 3 months
  • Freeze in squares for easy reheating

Flavor Variations

Apple Pie Baked Oatmeal:
Add 1 diced apple, 1 tsp cinnamon, and 2 tbsp brown sugar.

Banana Bread Baked Oatmeal:
Add 1–2 sliced bananas and a pinch of cloves.

Berry Coconut:
Add 1 cup mixed berries + ¼ cup shredded coconut.

Chocolate Chip Walnut:
Add ½ cup chocolate chips + ¼ cup chopped walnuts.

Final Thoughts

This Sourdough Discard Baked Oatmeal is one of those recipes that makes your whole kitchen smell magical—warm, comforting, and just a little bit nostalgic. It’s a true “stir it together and bake” breakfast that keeps your mornings simple and your tastebuds happy.

DOWNLOAD the Recipe HERE

🍂 Ready to Bake Like a Pro?

I've gathered all my favorite sourdough tools — from whisks and bannetons to enamel Dutch ovens — to make your baking magical.
👉 Grab Your Sourdough Baking Essentials Here

Want More Seasonal Sourdough Magic?

If you haven’t yet, make sure to check out these other favorites on the blog:

Savory Sage & Cheddar Sourdough

Caramelized Onion & Gruyere Sourdough Bread

Golden Sourdough Dinner Rolls

And don’t forget — I’ve put together everything you need to bake amazing sourdough bread all in one place.

The Magic Behind Every Great Loaf - 5 Essentials Every Sourdough Baker Needs

If you want to make your sourdough journey smoother (and your loaves even more magical), here are 5 essential tools every baker should have.