Sourdough Discard Chocolate Chip Cookies (The Overnight Ones)

I’m going to tell you the annoying part first. The best version of these cookies is not the one you bake twenty minutes after you mix the dough.

It’s the one you scoop, cover, and leave in the fridge until tomorrow.

That’s not me being precious about it. The dough is a mix of flour, butter, sugar and sourdough discard, and while it sits cold the flour hydrates, the butter firms up so the cookies spread less, and the discard keeps working on the sugars in there.

What comes out of the oven the next day is chewier, browner at the edges, and has this faint tang under the chocolate that makes people ask what you did differently.

You can bake them right away. They’ll be good cookies. But if you have the discard sitting in the fridge anyway, you have time, and the overnight version is the one worth writing down.

Why Sourdough Discard Belongs in a Chocolate Chip Cookie

Most sourdough discard recipes are quick breads. Pancakes, muffins, banana bread. Things where the discard is mostly just extra flour and water that happens to be sour.

Cookies are different, and I think it’s why sourdough discard cookies have gotten so popular. Discard is roughly half flour and half water, so it adds moisture without adding a wet ingredient like milk.

That moisture is what keeps the middle soft after the edges have set. And the acidity does something to the flavor of brown sugar and butter that plain flour never will. It’s the same reason a pinch of salt makes caramel taste like more.

There’s a lot of talk online about the fermentation making these “healthier.” I’m not going to make that claim for a cookie with two cups of chocolate chips in it.

I’ll make a more honest one: the discard makes them taste better, and it uses up something you were going to throw away.

Ingredients

Nothing here you don’t already own if you keep a starter.

Unsalted butter, softened. You want it soft enough to leave a fingerprint but not shiny or greasy. Too warm and the cookies spread flat. If you forgot to take it out, cut it into cubes and give it 20 minutes on the counter.

White sugar and light brown sugar. Equal-ish amounts. The brown sugar brings moisture and chew, the white sugar gives you crisp edges. Don’t go all brown, they’ll come out cakey and soft all the way through.

Two large eggs. Room temperature mixes in more evenly. Drop them in a bowl of warm tap water for five minutes if they’re cold.

Sourdough discard, 3/4 cup (189g). Straight from the fridge is fine. Unfed, week-old, whatever you’ve got. Active starter also works, you just won’t taste any difference in a cookie. Give it a stir before measuring so you’re not scooping the watery layer off the top.

Vanilla extract. Two teaspoons. This is a lot of dough.

All-purpose flour, 3 cups (420g). Weigh it if you can. Three cups of scooped-and-packed flour can be 60 or 70 grams more than three cups spooned in, and that’s the difference between a chewy cookie and a dry one.

Baking soda, baking powder, salt. Both leaveners. Soda reacts with the acidic discard and browns the edges, powder gives a little lift in the middle. And a full 1 1/2 teaspoons of salt. It seems like a lot in a sweet recipe. It’s not.

Chocolate chips, 2 cups. Semisweet is the classic. Chopped chocolate bars or chunks melt into bigger pools and honestly look better in photos. Milk chocolate works if that’s your household.

How to Make Sourdough Discard Chocolate Chip Cookies

Cream the butter and sugars. Stand mixer with the paddle, or a hand mixer and a big bowl. Beat until the mixture goes pale and fluffy, two or three minutes. You’re beating air into the butter here and that air is structure later.

Add the eggs, discard and vanilla. Mix again until it looks light and fluffy a second time. The discard will make the batter look slightly curdled for a moment. Keep going, it comes together.

Whisk the dry ingredients in a separate bowl. Flour, baking soda, baking powder, salt. Doing this separately means the leaveners get distributed instead of ending up in one bitter pocket.

Add the dry to the wet slowly, mix until just combined. Scrape the sides once. When you don’t see dry flour anymore, stop. Every extra turn of the mixer past this point develops gluten, and gluten in a cookie means tough.

Fold in the chocolate chips by hand. A spatula, not the mixer. Two cups of chips going through a paddle for thirty seconds is hard on the machine and breaks the chips into sad little shards.

Scoop into balls, about 3 tablespoons each. A #24 cookie scoop is roughly this size. You should get about 24. Set them on a parchment-lined sheet, two inches apart. They don’t have to be on the sheet you’ll bake on yet, this is just for chilling.

Chill. This is the step. Cover the tray with plastic wrap so the tops don’t dry out. One hour minimum if you’re in a hurry. Overnight, 12 to 24 hours, is where they get good. Up to two days works.

Bake at 375°F for 10 to 12 minutes. Straight from the fridge onto a fresh parchment-lined sheet if you need to. Pull them when the edges have gone golden and the centers still look a shade underdone. They finish setting on the rack.

Move them to a wire rack right away. Leaving them on the hot sheet keeps cooking the bottoms.

The Two Mistakes That Ruin Sourdough Cookies

I made both of these before I stopped making them.

Overbaking. These do not look done when they’re done. The center will look pale and puffy, and your instinct will say two more minutes. Don’t.

A soft cookie and a cakey cookie are the same dough, the only difference is 90 seconds in the oven. Trust the edges, pull them, and let the rack finish the job.

Skipping the chill. Room-temperature dough spreads before the edges set. You get a thin, flat cookie with the chips sticking up out of it like rocks in a pond. Even one hour cold changes the shape. Overnight changes the flavor.

Tips for Better Sourdough Discard Cookies

Flaky salt on top. A small pinch on each dough ball right before it goes in the oven. Optional, but it’s the difference between a good cookie and one people remember.

Want a chewier, thicker cookie? Swap half the all-purpose flour for bread flour, same weight. Bread flour has more protein, more protein means more chew. I’ve seen this in other discard cookie recipes and it works here too, but the card below is written for all-purpose because that’s what everybody has.

Don’t trust the clock, trust the oven thermometer. A reader on one of the big sourdough blogs couldn’t get crisp edges even after adding six minutes. Her oven was running cold. A $7 thermometer hanging off the rack will tell you more than any recipe can.

Use a scoop. Same size cookies bake at the same rate. Eyeballing gives you a tray where the small ones are overdone by the time the big ones are set.

Storage and Freezing

Baked cookies keep in a sealed container at room temperature for about a week. If they’re going stale, a slice of sandwich bread in the container gives them moisture back overnight. Old trick, still works.

Freezing the dough is the real move here. Scoop the balls, freeze them on the tray until solid, then dump them in a freezer bag. They keep for three months. Bake straight from frozen at 375°F, add a couple of minutes.

Make a double batch in October and you have warm cookies for every single person who walks through your door between Thanksgiving and New Year’s without ever mixing another bowl.

Baked cookies also freeze for three months. Cool completely, freeze on the sheet, then bag them with parchment between the layers. Thaw on the counter, or give them three or four minutes in a warm oven.

Frequently Asked Questions

Can I use active sourdough starter instead of discard? Yes. Either works and you won’t be able to tell in the finished cookie. The recipe doesn’t rely on the starter for rise, the baking soda and powder handle that.

Do I have to ferment the dough overnight? No. One hour cold gets you the right shape. Overnight gets you the flavor. Both are real cookies.

Can I chill the whole bowl instead of scooping first? You can, but scooping first is easier. Cold dough is stiff and hard to portion evenly. Scoop it soft, then chill.

Why did my cookies come out flat? Almost always one of three things. Butter was too warm, dough wasn’t chilled long enough, or the flour was under-measured. Weigh the flour and chill the dough and the problem usually goes away.

Can I make these with brown butter? Yes, but it changes the method. Brown butter is melted butter, and this recipe creams softened butter with the sugar for structure.

If you brown it, let it cool back to a soft paste in the fridge first, about 30 to 45 minutes, then cream it as written. If you use it warm and liquid the dough will be loose and the cookies will spread.

It’s worth trying once, the nutty flavor and the discard tang are good together.

Can I make these without sourdough discard? This recipe is built around it, so you’d be looking for a different chocolate chip cookie at that point.

If you’re in a pinch, replacing the 189g of discard with about 95g flour and 95g water gets you roughly the same hydration, but you lose the tang that makes these worth making.

Can I use whole wheat or fresh milled flour? Yes, weigh it rather than measuring by volume.

Whole grain flour absorbs more water, so the cookies will be a little denser and you may want to let the dough rest longer before baking.