Iced Oatmeal Cookies Made with Sourdough Discard

These iced oatmeal cookies made with sourdough discard are soft, chewy, and perfectly spiced. An easy from-scratch cookie recipe that uses discard for great texture and classic flavor.

There’s something so nostalgic about an iced oatmeal cookie, and this sourdough discard version makes them even better. For me, it’s one of those favorite cookies that instantly takes you back—soft centers, lightly crisp edges of the cookies, warm spice, and that simple vanilla icing that cracks just a little when you bite in. They feel familiar and comforting, the kind of cookie that doesn’t need to be flashy to be loved.

This sourdough discard oatmeal cookies version feels like the natural next step in from-scratch baking. The dough comes together easily, uses up extra starter, and bakes into soft, chewy cookies with just the right amount of spice.

Finished with a simple icing, they’re a cozy, from-scratch treat that feels familiar and special all at once. It uses up excess sourdough discard starter, brings a subtle slight tang, and creates the kind of chewy cookies that disappear faster than you expect.

It’s an easy recipe, one of those sourdough discard recipes that fits right into everyday life—no fuss, no waste, just good food made intentionally.

As a busy mom, I’m always reminding myself (and you) that this lifestyle doesn’t have to be all-or-nothing. You don’t need a hydration starter perfectly timed or an active sourdough starter bubbling on the counter to make these. Discard works beautifully here. This is a great way to stretch what you already have and turn it into something special without extra cost or overwhelm.

What You’ll Love About This Recipe

These cookies hit that sweet spot between cozy and practical. They’re soft, chewy, lightly spiced, and finished with icing that makes them feel just a little bit special—perfect for after-school snacks, Sunday baking, or slipping into a lunchbox the next day.

• You’ll love the texture of the cookies: the oats give structure, the icing adds contrast, and the sourdough discard creates a depth of flavor you don’t get in traditional oatmeal cookies. 
• This sourdough version isn’t sour—it’s balanced, with a gentle tang that enhances the spice instead of overpowering it.
• They’re also incredibly forgiving. You don’t need digital scales, specialty flours, or complicated techniques. A stand mixer with a paddle attachment is helpful, but a hand mixer or even a wooden spoon works just fine. This is real-life baking.

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Key Ingredients (and Why They Matter)

You can find the full ingredient list at the bottom of this post, but it helps to understand why these simple ingredients work so well together.

• Unsalted butter, softened to room temperature, gives you control over the salt and helps create that soft, chewy base. (No melted butter here—this recipe relies on creaming.)
• A mix of white sugar and brown sugar creates balance: sweetness, moisture, and that classic oatmeal cookie flavor.
• Molasses deepens the flavor and pairs beautifully with the spices.
• Egg yolk (yes, just the yolk—used intentionally) adds richness and contributes to the chewy texture.
• Sourdough discard brings moisture, structure, and that subtle tang. This is one of my favorite sourdough starter discard recipes–it’s so simple.
• Old-fashioned oats are key for perfect texture. Not quick oats, instant oats, or steel-cut oats—those change the structure of the dough.
• All-purpose flour (this is your purpose flour here, not bread flour or whole wheat flour) keeps the cookies tender.
• Warm spices like cinnamon and cloves give that classic iced oatmeal flavor.

You can find a full list of ingredients in the recipe card located at the bottom of this post.

This recipe doesn’t use brown butter, milk powder, or maple syrup, and it doesn’t include chocolate chips or juicy raisins. Those belong in other variations—like sourdough chocolate chip cookies, sourdough oatmeal chocolate chip cookies, or even the best sourdough oatmeal raisin cookies. This is the original recipe, and it’s meant to stay simple and doable, but make it your own too!

How to Make Iced Oatmeal Sourdough Discard Cookies

This is a straightforward process, broken into manageable steps. You’ll mix your wet ingredients and dry ingredients separately, then bring everything together into a soft, scoopable oatmeal cookie dough.

Cream the Butter and Sugars—Using a stand mixer fitted with a paddle attachment (or a large mixing bowl and hand mixer), cream the softened butter with the sugars until light and fluffy. This step matters—it sets the foundation for soft, chewy sourdough oatmeal cookies.

Add the molasses, sourdough discard, egg yolk, and vanilla (vanilla extract works beautifully here). Mix until fully combined.

Prepare the Oats and Dry Ingredients—Pulse the old-fashioned oats briefly in a blender or food processor. You’re looking for coarse—not flour. Transfer them to a large bowl or medium bowl.

In a separate bowl, combine the pulsed oats with the flour, baking soda, salt, cinnamon, and cloves. These are your dry ingredients.

Bring the Dough Together—Add the dry mixture into the wet mixture and mix on low speed until just combined. The dough will be thick but scoopable.

Scoop and Bake—Preheat your oven and line prepared baking sheets with parchment paper. Scoop the dough using a tablespoon cookie scoop (l inch sized balls) into evenly sized cookie dough balls and place them in a single layer on a parchment-lined baking sheet or large baking sheet.

Bake until the cookies are golden brown around the edges but still soft in the center. This bake time is key—overbaking will lose that chewy interior. Think 10–12 minutes, depending on your oven.

Right after baking, gently shape the cookies if needed by using at biscuit cutter to very gently shape the cookies until perfectly round. Then allow them to rest on the cookie sheet briefly before transferring them to a wire rack or cooling rack to cool completely.

Ice the Cookies—Once cooled, dip the tops into the simple vanilla icing and place them back on the wire rack to set. The icing will firm up while keeping the cookies soft underneath.

Baking Tips & Variations

• These baked cookies store best in an airtight container at room temperature.
• For longer storage, freeze un-iced cookies in a freezer bag or ziplock bag. Thaw and ice later.
• For best results, bake one first batch to check timing before baking the rest.
• This recipe is designed for discard, not active starter.

Recipe FAQs

More Sourdough Discard Cookies

If you love this one, you’ll also enjoy other sourdough discard cookies and sourdough discard recipes on the blog. Baking with discard is such a delicious way to stretch ingredients and make everyday life a little sweeter—right alongside sourdough breads and even sourdough breakfast cookies.

• Soft Sourdough Sugar Cookies with Discard
• Easy Sourdough Shortbread Cookies
• Chewy Sourdough Oatmeal Chocolate Chips Cookies

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If you make this recipe, please leave a rating on the recipe card below! I’d also love for you to tag me @autumn.chasingoursimple on Instagram so I can see what you’ve been baking!