Potato Flake Sourdough Pumpkin Snickerdoodle Cookies

If you’re looking for a fall cookie that’s soft, cozy, and absolutely irresistible, these Potato Flake Sourdough Pumpkin Snickerdoodles are exactly that. They’re everything we love about a classic snickerdoodle—soft, chewy, and rolled in warm cinnamon sugar—but with a seasonal twist: pumpkin puree and pumpkin pie spice added right into the dough… plus the magic of a potato flake sourdough starter.

This recipe makes about 50 small cookies, and I’ll go ahead and warn you: they disappear fast. Every time I make these, if I don’t guard the container, it magically empties long before the day is over. Something about the warm spice, light tang from the starter, and that soft snickerdoodle texture makes them addicting in the best way.

And the best part? The dough ferments in the fridge for 24 hours, which deepens the flavor, improves the texture, and makes the cookies bake up even better the next day. If you’ve never used potato flake sourdough starter in cookies, you’re going to be shocked at how much it elevates them.

Let’s walk through everything you need to know—from ingredients, to troubleshooting, to swap options, to how to store them. Then you’ll find a shortened, easy-to-read recipe card at the bottom.

Why Potato Flake Sourdough Works So Well in Cookies

Potato flake sourdough starter (whether active or discard) takes these cookies to the next level. Here is why I love using starter in my cookies:

Better texture

The natural fermentation tenderizes the dough as it rests in the fridge. They are the perfect chewy cookies with a soft and pillowy texture.

Improved flavor

The slight tang works beautifully with pumpkin and warm spices. It doesn’t make the cookies taste sour—it just rounds everything out like a bakery-style cookie.

Reduced gluten development

The long rest time helps create a more tender cookie and gives you a more even bake with better spread.

Longer shelf life

Fermented dough tends to stay soft longer… not that they’ll be around long enough to test that.

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Tools You’ll Need

• Stand mixer or hand mixer – For creaming the butter and sugars until fluffy.
• Large bowl – For dry ingredients
• Small Bowl – for cinnamon sugar mixture
• Measuring cups and spoons – To keep everything accurate.
• Rubber spatula – For scraping down the sides of the bowl.
• Cookie sheets – Light-colored sheets bake the most evenly.
• Parchment paper – Prevents sticking and helps the cookies bake uniformly.
• 1-tablespoon cookie scoop – Keeps all the cookies the same size.
• Wire cooling rack – Allows cookies to cool properly without getting soggy.

Ingredients You’ll Need

For the Cookie Dough

• All-purpose flour – Creates the structure and soft bite of the cookie.
• Baking soda – Helps the cookies rise and stay tender.
• Salt – Balances sweetness and brings out the flavors.
• Cream of tartar – Gives snickerdoodles their classic flavor and chewy texture.
• Pumpkin pie spice – Adds warm, cozy fall flavor throughout the dough.
• Maple extract – Don’t skip this if you can help it! It gives a subtle maple warmth that pairs perfectly with pumpkin flavor.
• Unsalted butter, softened – Gives richness and creates that soft, melt-in-your-mouth texture.
• Brown sugar – Adds moisture and deep caramel flavor.
• Granulated sugar – Helps with structure and light crisp edges.
• Egg yolk – Makes the cookies rich and tender.
• Pumpkin puree – Adds moisture and that unmistakable fall flavor (not pumpkin pie filling).
• Potato flake sourdough starter – You can use active sourdough starter or sourdough starter discard. Either adds depth, delicious flavor, and fermentation benefits that improve digestibility and texture.

For the Cinnamon-Sugar Coating

• Granulated sugar – Creates the signature snickerdoodle crust.
• Ground cinnamon – Warm, sweet spice that complements the pumpkin.
• Pumpkin pie spice – Boosts the fall flavor in every bite.

How to Make Pumpkin Snickerdoodle Sourdough Cookies

Even though the recipe itself is simple, here are some detailed notes so you feel confident the whole way through.

Mix the dry ingredients

You’ll whisk together the flour, baking soda, salt (skip salt if your butter is salted), cream of tartar, and pumpkin pie spice. Sifting the baking soda keeps it from clumping in the dough.

Beat the butter and sugars

Creaming them for a full 2–3 minutes helps create soft, thick cookies. Don’t rush this step—fluffy butter = fluffy cookies.

Add the wet ingredients

You’ll mix in the egg yolk, pumpkin puree, maple extract, and starter. The mixture will be soft and creamy.

Add the dry ingredients

Once the paddle attachment goes in, mix on low just until the flour disappears. Overmixing can make the cookies tough or cause them to spread too much.

Chill the dough (the most important part!)

This dough is best from a 24-hour chill in the fridge.
Here’s why:

• It hydrates the flour
• Gives the fermentation time to work
• Helps the spices develop
• Prevents the cookies from spreading too thin

You can even leave it up to 4 days—great for make-ahead holiday baking.

Roll and bake

A tablespoon-sized scoop keeps them small, soft, and easy to snack on (dangerous, I know).Roll cookie dough balls in pumpkin-spice cinnamon sugar, flatten slightly, and bake just 8 minutes.

They might look fluffy and underbaked when you pull them out—that’s exactly how they should look. They’ll set as they cool.

Allow them to cool on the cookie sheet for 5 minutes before moving to a cooling rack.

Tips for the Best Cookies

• Use parchment paper. Prevents sticking and helps them bake evenly.
• Flatten them slightly before baking. Because chilled dough can hold its shape a little too well.
• Don’t overbake. They should still look soft in the center when you remove them.
• Bake one tray at a time. Middle rack always gives the most consistent results.
• For thicker cookies: Chill the dough longer or freeze scooped dough for 10 minutes before baking.

Ingredient Swap Options

All swaps keep measurements the same:

Butter

• Salted butter works—just leave out the added salt. You could also try using brown butter for an even deeper flavor, although I haven’t tried this, so if you do try it out, let us know how it turns out for you! 

Pumpkin Puree

• Sweet potato puree works beautifully too and is a great way to use up left over sweet potatoes from the holidays.

Spices

• You can replace pumpkin spice with a mix of cinnamon + nutmeg + cloves if needed.

Maple Extract

• This is not an extract many people keep on hand, but I HIGHLY recommend it if you can. In a pinch you can use 1 teaspoon of vanilla extract instead. Maple extract has a much stronger flavor so you will need more vanilla.

How to Store & Freeze

At room temperature

Store in an airtight container for up to 3 days.
They are best the first and second day.

To freeze the dough

• Scoop into dough balls
• Roll in cinnamon-sugar
• Freeze on a tray
• Move to a freezer bag once solid. I like to freeze mine in increments perfect for serving my family plus a few extra. That makes sure I always have a quick dessert on hand if people come over. Also, using a vacuum sealer ensures they stay fresh from freezer burn.

Bake straight from frozen—add 1–2 minutes.

Frequently Asked Questions

Can I skip the fermentation time?

Technically yes, but they won’t have the same flavor, texture, or benefits. The 24-hour chill isn’t just for sourdough—it truly makes these cookies better. If you skip the fermentation, you still need to chill your dough for at least 2 hours or you cookies may spread too much in the oven.

Is the sourdough flavor strong?

Not at all. The starter adds depth but not sourness.

Can I use sourdough discard?

Yes! Active or discard both work exactly the same here.

Why are my cookies spreading too much?

This usually means the dough wasn’t chilled long enough.

Can I make the cookies bigger?

Absolutely. Just add 1–2 minutes to the bake time.

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