The Best Sourdough Oatmeal Cookies Ever

These sourdough oatmeal cookies are going to change your life — and that's not an exaggeration. They're perfectly chewy and sweet, with just the right amount of cozy cinnamon and nutmeg to warm you up from the inside out.

They stay soft for days, which makes them perfect for lunches and snacks. If you love the idea of sourdough in a cookie, you have to try my sourdough chocolate peanut butter swirl cookies next. They're also a classic addition to any holiday cookie box paired with my festively green matcha white chocolate cookies.

Why You'll Love This Recipe

Soft and chewy, never dry. An 8-minute bake and a pull-while-slightly-underdone approach keep these tender for days.

Cozy warm spice. Cinnamon and nutmeg make these taste like fall in cookie form, much like my chewy sourdough gingerbread cookies.

That maple glaze. A cinnamon-maple drizzle (or dunk!) sets on top and is genuinely addictive.

A real use for discard. Like my sourdough discard peanut butter cookies and fudgy sourdough discard brownies, this turns the starter you'd toss into something worth craving.

Make-ahead and freezer friendly. Scoop the dough balls and chill or freeze, then bake whenever a craving strikes.

Ingredients You'll Need

For the cookies:

• Butter — softened and creamed for a rich, chewy base.
• Dark brown and white sugar — brown for chew and molasses depth, white for structure.
• Vanilla extract — for warmth.
• Sourdough discard — fed or unfed; adds a subtle tang and tenderness.
• Eggs — room temperature, for structure and chew.
• All-purpose flour, baking soda, and salt — the base and lift.
• Cinnamon and nutmeg — that cozy, warming spice.
• Quick-cooking oats — for soft texture (rolled oats work too, with more chew).

For the optional maple glaze:

• Powdered sugar, 100% maple syrup, cinnamon, vanilla, and a splash of milk — whisked into a drizzle-able glaze that sets on top.

See the recipe card for quantities.

Easy Substitutions & Variations

Dairy-free: Use a non-dairy stick butter (Country Crock's plant butter is my go-to).

Sourdough-free: Omit the discard and use 240–250g of flour instead of 270g.

Rolled oats: Swap in old-fashioned rolled oats for a chewier, heartier texture — many people prefer them. For another oaty, lunchbox-friendly bake, try my easy sourdough breakfast cookies.

Chocolate: Add chocolate chips for oatmeal chocolate chip cookies (feel free to omit the spices). If you love a good chocolate cookie, you'll also love my sourdough chocolate crinkle cookies.

Extra spice: Add ½ teaspoon cardamom and/or ginger for a fun chai flavor.

Skip the glaze: They're delicious plain, too — pair them with my chewy brown butter sugar cookies for a simple cookie plate.

Instructions

1. Cream the butter and sugars. Preheat the oven to 375°F and line a baking sheet. Beat the softened butter, brown sugar, white sugar, and vanilla until light and fluffy, about 5–10 minutes.

Remember to scrape down the sides of the bowl periodically to make sure everything is incorporated!

2. Add the discard and eggs. Scrape down the bowl, then add the sourdough discard and eggs. Mix until just combined.

3. Add the dry ingredients. In a separate bowl, whisk the flour, cinnamon, nutmeg, baking soda, salt, and oats. Slowly add to the wet ingredients and mix until combined.

4. Scoop and bake. Scoop dough balls 2 inches apart on the prepared sheet. Lightly flatten each with a fork for even baking (optional but recommended). Bake for 8 minutes — the tops will look slightly underdone, which is perfect.

5. Cool. Let the cookies cool on the pan for at least 5 minutes (they finish cooking here), then transfer to a rack to cool completely before glazing.

6. Make the maple glaze. Whisk the powdered sugar, maple syrup, cinnamon, and vanilla until smooth, adding milk 1 teaspoon at a time if too thick. Drizzle over the cooled cookies — or dunk the tops in for extra glaze. Let set before serving.

Weigh your ingredients! Using a kitchen scale ensures your measurements are accurate, which is key for getting consistent results in baking. It takes the guesswork out of measuring and helps your recipes turn out exactly as intended every time.

Expert Tips

1. Don't overbake. This is the #1 rule — 8 minutes is my sweet spot. The tops should look slightly underdone when they come out; they finish on the hot pan and stay soft and chewy.

2. Bake a test cookie. Ovens vary, so bake one first to dial in your exact time before committing a whole sheet.

3. Cream the butter and sugars well. A full 5–10 minutes of beating builds the structure that keeps these chewy.

4. Glaze fully cooled cookies. Warm cookies will melt the glaze instead of letting it set into that signature crackly top.

5. Dunk, don't just drizzle. Dunking the tops is easier and gets you more glaze per cookie — a win-win.

What Makes This Recipe Special?

Oatmeal cookies have a reputation for being dry and crumbly, but these are the opposite: genuinely soft and chewy, thanks to a generous amount of butter, the right ratio of brown to white sugar, and a deliberately short bake. The sourdough discard adds a quiet tang and a touch of tenderness while using up the starter you'd otherwise toss.

But the real showstopper is the cinnamon maple glaze. It sets into a thin, crackly layer on top that brings out the chewiness underneath and adds a cozy, maple-sweet finish you won't find on a standard oatmeal cookie. It's the kind of small detail that turns a classic into a recipe people ask you to make again — the same care that goes into my perfectly chewy chocolate chip cookies.

Sourdough Discard Oatmeal Cookies FAQ

Oatmeal Cookie Troubleshooting Guide

Storage

Room temperature: Store in an airtight container for 4–7 days — they get even better after day two!

Freezer: Freeze baked cookies (or the scooped dough balls) in a freezer-safe container for up to 6 months.

Other Sourdough Discard Recipes to Consider

Sourdough Oatmeal Cookies with Discard

Audrey Grubb

My sourdough oatmeal cookies are the perfect way to enjoy a delicious, cinnamony treat while also using up some of your sourdough starter. These cookies are soft and chewy with an optional maple glaze that hardens on top to really bring out the cookie's chewiness. Warning: these are addicting!

5 from 2 votes

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 8 minutes mins

Total Time 23 minutes mins

Course Dessert

Cuisine American

Servings 40 Cookies

Calories 152 kcal

Equipment

• ▢
  Stand Mixer
• ▢
  Cookie sheet
• ▢
  Parchment paper or baking mat
• ▢
  Cookie scoop

Ingredients

  

1x2x3x

For the cookies:

• ▢ 227 g butter softened (1 cup)
• ▢ 300 g brown sugar packed (1½ cups)
• ▢ 100 g white sugar ½ cup
• ▢ 2 teaspoon vanilla extract
• ▢ 60 g sourdough discard ¼ cup
• ▢ 2 eggs room temperature
• ▢ 270 g all-purpose flour 2¼ cups
• ▢ 1½ teaspoon cinnamon
• ▢ ½ teaspoon nutmeg
• ▢ 1 teaspoon baking soda
• ▢ 1 teaspoon salt
• ▢ 270 g quick-cooking oats 3 cups

For the maple glaze (optional):

• ▢ 120 g powdered sugar 1 cup
• ▢ ¼ –⅓ cup 100% maple syrup
• ▢ ¼ teaspoon cinnamon
• ▢ ½ teaspoon vanilla extract
• ▢ Milk as needed for consistency (add 1 teaspoon at a time)

Instructions

 

• Preheat the oven to 375°F and line a baking sheet with parchment or a silicone mat.
• Beat the softened butter, sugars, and vanilla until light and fluffy, 5–10 minutes.
  227 g butter, 300 g brown sugar, 100 g white sugar, 2 tsp vanilla extract
• Scrape down the bowl, add the sourdough discard and eggs, and mix until just combined.
  60 g sourdough discard, 2 eggs
• In a separate bowl, whisk the flour, cinnamon, nutmeg, baking soda, salt, and oats.
  270 g all-purpose flour, 1½ tsp cinnamon, ½ tsp nutmeg, 1 tsp baking soda, 1 tsp salt, 270 g quick-cooking oats
• Slowly add the dry ingredients to the wet and mix until combined.
• Scoop dough balls 2 inches apart on the sheet and lightly flatten with a fork. Bake for 8 minutes — tops will look slightly underdone.
• Cool on the pan at least 5 minutes, then transfer to a rack and cool completely.
• Maple glaze: Whisk the powdered sugar, maple syrup, cinnamon, and vanilla until smooth, thinning with milk 1 teaspoon at a time if needed. Drizzle or dunk the cooled cookies, then let set.
  120 g powdered sugar, ¼ –⅓ cup 100% maple syrup, ¼ tsp cinnamon, ½ tsp vanilla extract, Milk

Notes

1. Don't overbake — these stay soft and chewy when pulled at 8 minutes. Bake a test cookie to dial in your oven.
2. Store at room temperature for 4–7 days (better after day two!) or freeze for up to 6 months.
3. Scoop dough balls ahead and bake from chilled or frozen, adding 1–2 minutes.

Nutrition

Calories: 152kcalCarbohydrates: 25gProtein: 2gFat: 5gSaturated Fat: 3gPolyunsaturated Fat: 0.4gMonounsaturated Fat: 1gTrans Fat: 0.2gCholesterol: 20mgSodium: 126mgPotassium: 35mgFiber: 1gSugar: 15gVitamin A: 154IUVitamin C: 0.004mgCalcium: 8mgIron: 1mg

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