These nutritious and delicious sourdough breakfast cookies are kid-friendly and picky-eater-approved! Packed with oats, peanut butter, flax, and sweet ripe banana, they're soft, lightly chewy, and naturally sweetened — a real breakfast disguised as a cookie. My toddler is a notoriously picky eater but will never turn down a "cookie," so these were born out of a need to sneak some protein and fiber into his morning. (I add a few mini chocolate chips sometimes because he loves them.)
They come together in one bowl in about five minutes, no mixer required. If your family goes through discard the way mine does, you'll also want my sourdough discard peanut butter cookies for a sweeter treat, a loaf of sourdough banana bread for those extra-spotty bananas, or a slice of sourdough discard coffee cake for slower weekend mornings.
Quick Look: Sourdough Discard Breakfast Cookies
⏱️ Ready In: 20 minutes
🔥 Bake Time: 14–15 minutes
🍽️ Serves: 7 cookies
✨ Calories: 164 per cookie
🥄 Main Ingredients: oats, banana, peanut butter, sourdough discard, flaxseed
🌿 Dietary: Vegetarian (easily vegan)
💛 Why You'll Love It: a wholesome, one-bowl breakfast your kids will think is a cookie
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Why You'll Love This Recipe
A breakfast that feels like a treat. Soft, chewy, and naturally sweetened with ripe banana — picky-eater approved, no convincing required.
One bowl, five minutes, no mixer. Even faster to throw together than a batch of overnight oats, and you get a warm, portable breakfast out of it.
Genuinely nutritious. Oats and flax bring fiber, peanut butter and egg bring protein and healthy fats, and there's no refined sugar required.
A smart use for discard. Like my sourdough chocolate chip muffins, these put your starter to work in something the whole family will actually eat.
Totally customizable. Keep them low-sugar, add chocolate chips, or stir in whatever your kids love — they're very forgiving.
Jump to:
- Quick Look: Sourdough Discard Breakfast Cookies
- Why You'll Love This Recipe
- Ingredients
- Easy Substitutions & Variations
- How to Make Sourdough Breakfast Cookies
- Expert Tips
- What Makes This Recipe Special?
- Sourdough Breakfast Cookie FAQs
- Breakfast Cookie Troubleshooting Guide
- Storage
- Other Breakfast Recipes to Consider
- Sourdough Oatmeal Breakfast Cookies
Ingredients
- Quick-cooking oats — my preference for a soft, chewy texture, though old-fashioned rolled oats work too.
- Ripe banana — the riper the better; it's the main sweetener and binder.
- Egg — for a little extra protein and structure (easily left out to make these vegan).
- Peanut butter — protein, healthy fats, and that kid-favorite flavor.
- Sourdough discard — fed or unfed; adds a subtle tang and uses up your starter.
- Ground flaxseed — fiber and omega-3s, and it helps bind the dough.
- Cinnamon and salt — for warmth and balance.
- Maple syrup (optional) — a touch of extra sweetness if your bananas aren't very ripe.
- Chocolate chips (optional) — mini chips are my toddler's favorite add-in.
See the recipe card for quantities.
Easy Substitutions & Variations
Make them vegan: The egg isn't essential — leave it out and the peanut butter, banana, and discard will still bind everything together.
Rolled oats instead of quick oats: Totally fine. You may need a spoonful or two more oats to get a scoopable consistency, since rolled oats absorb a little less.
Low-sugar: Skip the maple syrup and chocolate chips and let the ripe banana be the star.
Add-ins: Stir in raisins, chopped nuts, shredded coconut, or a spoonful of chia seeds.
Want a sweeter, dessert-style cookie? Try my sourdough oatmeal cookies instead — same cozy oat base, but firmly in treat territory.
How to Make Sourdough Breakfast Cookies
This is a one-bowl recipe — no mixer needed. A 3-tablespoon (2-inch) cookie scoop makes 7 evenly sized cookies.
Step 1: Mix the dry ingredients. Preheat the oven to 350°F. In a medium bowl, stir together the oats, cinnamon, salt, and ground flaxseed.
Step 2: Add the wet ingredients. To the same bowl, add the mashed banana, egg, peanut butter, maple syrup (if using), and sourdough discard.
Step 3: Mix and add chocolate chips. Stir until fully combined, then fold in chocolate chips to taste, if using.
Step 4: Scoop, flatten, and bake. Scoop the dough onto a prepared baking sheet and use a fork to gently press each one flat — these won't spread or rise, so shape them now. Bake for 14–15 minutes.
Let them cool slightly before serving — they firm up as they cool.
Expert Tips
1. Use a very ripe banana. Lots of brown spots and a thin peel mean maximum natural sweetness — this is what keeps the cookies sweet without much added sugar.
2. Flatten before baking. These cookies don't spread or rise, so whatever shape you press them into is the shape they keep. Use a fork to flatten to about ½ inch.
3. Match the consistency, not just the measurements. If you swap in rolled oats or use a small banana, the dough may need a spoonful more oats to be scoopable — aim for the texture in the photos.
4. Make a double batch. They keep well and freeze beautifully, so it's worth doubling for grab-and-go breakfasts all week.
What Makes This Recipe Special?
Most "breakfast cookies" lean heavily on added sugar to win kids over. These don't need to — a really ripe banana does the sweetening, while oats, flax, peanut butter, and egg quietly pack in fiber, healthy fats, and protein. The sourdough discard is the clever part: it uses up the starter you'd otherwise toss and adds a faint tang that keeps these from tasting flat or overly "healthy."
The result is a one-bowl, five-minute breakfast that genuinely feels like a treat — the same sneaky-wholesome approach behind my sourdough zucchini muffins. For a picky toddler (or a busy adult who wants something better than a granola bar), that combination is hard to beat.
Sourdough Breakfast Cookie FAQs
No — rolled oats work well too. The peanut butter, banana, and discard are good binders. If using rolled oats, you may need a little more to get a scoopable dough.
Yes! Just leave out the egg. The cookies hold together fine without it.
Absolutely — fed or unfed both work here, since the discard is for flavor and moisture rather than rise.
A ripe banana usually does the trick. If yours isn't very ripe, add the maple syrup and a few chocolate chips and you're set.
Yes. They're perfect make-ahead breakfasts — bake a batch and store or freeze (see Storage below). A glass of a blueberry oatmeal smoothie alongside makes a complete grab-and-go breakfast, and make-ahead pumpkin cream cold brew overnight oats or Biscoff overnight oats help keep the week's breakfasts interesting.
Breakfast Cookie Troubleshooting Guide
| Problem | Cause | Fix |
|---|---|---|
| Dough too wet to scoop | Large banana or rolled oats | Stir in oats 1 tablespoon at a time until scoopable |
| Cookies too dry/crumbly | Overbaked, or too much oats added | Bake just to 14–15 min; add oats sparingly |
| Cookies didn't spread | They're not meant to! | Flatten with a fork before baking |
| Not sweet enough | Banana wasn't ripe enough | Use a very spotty banana, or add maple syrup |
| Falling apart (vegan version) | Needs more binder | Add 1 tablespoon extra peanut butter or a flax egg |
Storage
Room temperature: Store in an airtight container for 3–5 days.
Refrigerator: Keep in an airtight container for up to 5 days — great for grab-and-go mornings.
Freezer: Freeze in a freezer-safe container for up to 6 months. Thaw at room temperature or warm briefly in the microwave.
Other Breakfast Recipes to Consider
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Sourdough Oatmeal Breakfast Cookies
Equipment
- mixing bowl
- Cookie scoop (this is my set-- I used the largest one for these cookies because I like to give my son ½ of a cookie at a time)
- Cookie sheet
Ingredients
- 90 g quick-cooking oats 1 cup, or old-fashioned
- 1 ripe banana mashed (~115g)
- 1 egg
- 1 teaspoon cinnamon
- ½ teaspoon salt
- 14 g ground flaxseed/flaxseed meal 2 Tbsp
- 40 g maple syrup 2 Tbsp, optional
- 64 g peanut butter ¼ cup
- 60 g sourdough discard fed or unfed (¼ cup)
- 30 g chocolate chips 2–3 Tbsp, optional
Instructions
- Preheat the oven to 350°F. In a medium mixing bowl, stir together the oats, cinnamon, salt, and flaxseed meal.90 g quick-cooking oats, 1 tsp cinnamon, ½ tsp salt, 14 g ground flaxseed/flaxseed meal
- To the same bowl, add the mashed banana, egg, peanut butter, maple syrup (if using), and sourdough discard.1 ripe banana, 1 egg, 40 g maple syrup, 64 g peanut butter, 60 g sourdough discard
- Mix until combined, then fold in chocolate chips to taste, if using.30 g chocolate chips
- Scoop onto a prepared baking sheet and use a fork to lightly press each cookie flat — these will not rise or spread. Bake for 14–15 minutes.
- Let cool slightly before serving; they firm up as they cool.
Notes
- Don't forget to press the cookies flat before baking — they won't rise or spread!
- Use a very ripe banana (lots of brown spots, thin peel) for the best natural sweetness.
- Makes about 7 cookies with a 3-tablespoon (2-inch) scoop or 12-14 with a 2-tablespoon scoop. Store at room temperature for 3–5 days, or freeze for up to 6 months.
Paige Gary says
Anytime I can tell my toddler he is having a “cookie” but he’s actually getting some nutrients in him I’m all about it haha love this recipe!