These brown butter chocolate chip cookies have crisp, caramelized edges, soft chewy centers and a deep toffee flavor that comes from two things: butter cooked until its milk solids turn nutty brown, and a dough that rests in the fridge for a full day. Everything is measured in grams. Hands on, it's about an hour, plus the overnight rest.
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When is brown butter ready?
Browning butter is a matter of watching closely for 6 to 9 minutes. Use a clean titanium-surface skillet with a light interior so you can watch the butter solids change color. Melt the butter over medium heat and stir or swirl it often.
| Stage | What you see | What you smell |
|---|---|---|
| Melting | Clear yellow butter, a little white foam | Plain butter |
| Sputtering | Loud crackling and big bubbles as the water boils off | Mild, milky |
| Quiet foam | Noise drops, fine foam covers the top, specks appear on the bottom | Starting to smell toasty |
| Ready | Specks are hazelnut brown, butter is deep amber | Nutty, like toffee |
| Too far | Specks are black | Bitter, burnt |
The jump from ready to burnt takes less than a minute, so pour the butter into a heatproof mixing bowl the moment the specks look like hazelnuts. Scrape every brown bit out of the pan with a spatula. Those toasted milk solids are where most of the flavor lives. It's the same technique as the sauce for pan seared scallops with brown butter, only here every speck goes into the dough.
Why does the dough need to rest for 24 hours?
Freshly mixed dough bakes into a perfectly good cookie, but rested dough bakes into a better one. Several things happen while it sits in the fridge.
- The flour hydrates. The eggs slowly soak into the flour, so the dough firms up and spreads less, giving thicker cookies with chewier centers.
- Flavor develops. Enzymes in the flour break some starch down into simpler sugars, and the sugar dissolves further. Those sugars brown more in the oven, adding deeper caramel and toffee notes on top of the brown butter.
- The surface browns more evenly. Rested dough bakes with a darker, more crinkled top and crisper edges.
Two hours is the minimum. It's enough to firm the brown butter so the cookies don't spread into thin puddles, but most of the flavor change happens between 24 and 72 hours. Past 3 days the dough starts to dry out and the cookies turn crumbly. Cover the bowl tightly, or portion the dough into balls first, which makes baking day faster.
How much water does browning take out of the butter?
Butter is roughly 80 percent fat, 15 to 17 percent water and a few percent milk solids. As it browns, nearly all of that water boils away, which is what all the sputtering is. A 227 g block ends up at about 190 g of brown butter. That missing water would normally help dissolve sugar and form gluten, so without it cookies can bake up dry and sandy.
This recipe makes up for it with an extra egg yolk. The yolk adds back a little water plus fat and emulsifiers, which keeps the centers chewy and soft.
Temperature matters as much as quantity. Let the brown butter cool for about 20 minutes, until it's warm but no longer hot, around 85°F (29°C). Whisked into the sugars while it's still hot, it melts them into a greasy syrup and the eggs can start to set, giving flat, oily cookies.
Chopped chocolate vs chips: which melts better?
Chocolate chips are made to keep their shape in the oven. They contain less cocoa butter than bar chocolate, which keeps them in neat, distinct drops. Chopped bar chocolate behaves differently. It breaks into shards of every size, so the cookie gets fine flecks running through the dough plus big pieces that melt into flat, glossy pools on top.
For these cookies, a 60 to 70 percent dark chocolate bar works best. Its bitterness balances the sweetness of the brown sugar and stands up to the nutty butter. Chop it with a serrated knife into pieces roughly the size of a fingernail and keep the crumbs; they streak through the dough.
A mix also works well: 150 g chopped bar chocolate with 100 g chips gives you both pools and pockets. Press 3 or 4 extra pieces onto the top of each dough ball before baking so the chocolate shows on the surface. If you enjoy dark chocolate desserts that lean bittersweet, a molten chocolate lava cake uses the same kind of bar.
Baking straight from the fridge
Bake the dough cold. Cold dough holds its shape longer in the oven, so the edges set and caramelize before the middle has time to spread thin. Portion it into 50 g balls, about 3 tablespoons each, and leave 3 inches between them on a parchment lined sheet, 8 to a pan.
At 375°F (190°C) they take 11 to 13 minutes. Pull them when the edges are golden brown and set, but the centers still look puffy, pale and slightly underdone. They finish cooking on the hot pan. Sprinkle a few flakes of sea salt over each one right away while the tops are still soft enough to grab it.
Leave the cookies on the sheet for 5 minutes before moving them to a rack. They're fragile while hot and firm up as they cool. Bake one sheet at a time on the center rack for even color, and let the sheet cool between batches. Stored airtight, they stay chewy for 3 days. Unbaked dough balls freeze well, so you can bake two or three fresh cookies at a time.
The recipe
Chewy Brown Butter Chocolate Chip Cookies with Rested Dough
Ingredients
For the brown butter
- 227 g (1 cup) unsalted butter
For the dough
- 200 g (1 cup lightly packed) dark brown sugar
- 100 g (1/2 cup) granulated sugar
- 2 large eggs, at room temperature
- 1 large egg yolk, at room temperature
- 10 ml (2 teaspoons) pure vanilla extract
- 280 g (2 1/3 cups) all-purpose flour
- 5 g (1 teaspoon) baking soda
- 6 g (1 teaspoon) fine sea salt
- 250 g 60 to 70 percent dark chocolate, chopped, or a mix of chopped chocolate and chips
- Flaky sea salt, for sprinkling
Instructions
- Brown the butter. Melt the butter in a light colored saucepan over medium heat, swirling often, for 6 to 9 minutes, until it stops sputtering, smells nutty and the solids on the bottom are hazelnut brown. Pour it into a large heatproof bowl, scraping in all the brown bits.
- Cool the butter. Let the brown butter cool for about 20 minutes, until warm to the touch, around 85°F (29°C).
- Mix sugars and eggs. Whisk the brown sugar and granulated sugar into the butter for 1 minute. Add the eggs, egg yolk and vanilla and whisk for another minute, until thick, glossy and lighter in color.
- Add the dry ingredients. Whisk the flour, baking soda and salt in a separate bowl, then fold them into the wet mixture with a spatula until just a few dry streaks remain. Fold in the chopped chocolate until evenly mixed.
- Rest the dough. Cover tightly and refrigerate for at least 2 hours and ideally 24 to 72 hours. For easier baking, scoop the dough into 50 g balls before chilling.
- Bake cold. Heat the oven to 375°F (190°C). Place 8 cold dough balls 3 inches apart on a parchment lined sheet and bake on the center rack for 11 to 13 minutes, until the edges are golden and set but the centers look pale and puffy.
- Salt and cool. Sprinkle each cookie with flaky salt straight away. Cool on the sheet for 5 minutes, then move to a rack. Repeat with the remaining dough, using a cool baking sheet each time.
Cook's notes
- Dough balls freeze for up to 3 months. Bake from frozen at 375°F, adding 2 to 3 minutes.
- Light brown sugar works in place of dark; the cookies will be slightly paler with a milder caramel note.
- For rounder cookies, swirl a large round cutter or glass around each hot cookie right out of the oven to tuck in the edges.
- If using salted butter, cut the fine sea salt to 3 g (1/2 teaspoon).
Chewy Brown Butter Chocolate Chip Cookies questions
Why did my brown butter cookies spread flat?
Flat brown butter cookies usually mean the butter was still hot when the sugar went in, or the dough wasn't chilled. Cool the browned butter to about 85°F before mixing, rest the dough for at least 2 hours, and bake it straight from the fridge on a cool baking sheet. Measuring flour by weight, 280 g, also helps.
How long can chocolate chip cookie dough rest in the fridge?
Tightly covered, chocolate chip cookie dough keeps in the fridge for up to 72 hours, and most of its flavor development happens in that window. After about 3 days it starts to dry out and the cookies bake up crumbly. For longer storage, scoop the dough into balls and freeze them for up to 3 months.
Is it safe to eat raw cookie dough?
Raw cookie dough carries two risks: raw eggs, which can contain salmonella, and raw flour, which can carry E. coli because it isn't treated to kill bacteria. Food safety agencies advise against eating it, especially for children, pregnant people and older adults. Bake the dough fully, or use a recipe made for eating raw with heat treated flour and no eggs.
Should I use salted or unsalted butter for brown butter?
Unsalted butter is easier to control, since salt content varies a lot between brands and salted butter tends to foam more, which hides the color of the browning solids. If salted butter is all you have, it works fine. Brown it the same way and reduce the added salt in the dough by about half.
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