Rich, fudgy brownies swirled with creamy peanut butter and finished with a whisper of flaky sea salt—this is the dessert that converts even the most disciplined into sworn chocoholics.

Ingredients You'll Need

Quality matters here. Reach for a Dutch-process cocoa like Valrhona or Guittard for the deepest chocolate flavor; natural cocoa will leave these brownies tasting flat and a tad sour. For the peanut butter swirl, conventional brands such as Jif or Skippy stay creamy during baking, while natural versions can separate and leave oily pockets. If you only keep natural PB on hand, stir in 1 teaspoon of melted coconut oil to stabilize it.

Butter creates the glossy, crackly top we all fight over, so splurge on a European-style butter with 82–84 % butterfat. The extra fat keeps the crumb tender even if you accidentally over-bake by a minute or two. For sugar, you’ll see a blend of granulated and dark brown; the molasses in the brown sugar adds chew and that subtle caramel back-note that makes people ask, “Why are these so much better than mine?”

Eggs should be at true room temperature—68–70 °F—so the emulsion forms quickly and the batter doesn’t seize when it hits the melted chocolate. A pinch of espresso powder is optional but genius; it amplifies cocoa without tasting like coffee. Finally, use Maldon or another large-flake sea salt for finishing. The delicate shards linger on the palate, giving you tiny bursts of salinity against all that sweetness.

How to Make Indulgent Chocolate Peanut Butter Brownies with Sea Salt

Prep the pan & oven

Move the rack to the lower-third position and preheat to 350 °F (175 °C). Line a 9×13-inch light-colored metal pan with parchment, leaving wings on the long sides so you can lift the cooled slab out cleanly. Avoid glass pans—they retain heat and over-bake the edges before the center sets.

Brown the butter

Place ¾ cup (170 g) unsalted butter in a medium stainless skillet over medium heat. Stir constantly as it foams; when the milk solids turn chestnut brown and the aroma smells nutty, pull it off the heat and pour into a heat-proof bowl to stop cooking. Cooling for 10 minutes prevents scrambled eggs later.

Whisk dry ingredients

In a medium bowl whisk 1 cup (95 g) Dutch-process cocoa, 1 cup (128 g) all-purpose flour, 1 teaspoon fine sea salt, ½ teaspoon baking powder, and ¼ teaspoon espresso powder. Sifting isn’t necessary—just whisk energetically to break up cocoa lumps.

Build the sugar base

To the browned butter bowl add 1 ¼ cups (250 g) granulated sugar and ½ cup (110 g) packed dark brown sugar. Whisk until the mixture looks like wet sand and the sugars have absorbed the butter. This step dissolves the sugars partially so the top crust forms properly.

Add eggs & flavor

Whisk in 3 large eggs, one at a time, waiting until each is fully incorporated before adding the next. Stir in 2 teaspoons pure vanilla extract. The batter should be thick, shiny, and lighter in color—evidence of proper emulsion.

Fold in chocolate & flour

Using a silicone spatula, fold in ¾ cup (135 g) chopped bittersweet chocolate (60–65 %) until half melted by residual heat. Add the dry ingredients all at once and fold just until you see no streaks of flour. Over-mixing develops gluten and yields cakey brownies.

Swirl on the peanut butter

Scrape the batter into the prepared pan and level with an offset spatula. Dollop ⅔ cup (190 g) creamy peanut butter in 8 teaspoon-sized mounds. Drag a skewer or toothpick through the mounds in figure-eights to create marbled ribbons without over-mixing.

Bake & finish

Bake 27–30 minutes, rotating at the 15-minute mark. The edges should look firm and slightly puffed; a toothpick inserted 2 inches from the edge should come out with a few moist crumbs. Immediately sprinkle ½ teaspoon flaky sea salt across the surface. Cool completely in the pan on a wire rack—at least 2 hours—so the interior sets into that coveted fudgy density.

Expert Tips

Check oven temp

Brownies are unforgiving of hot spots. Use an oven thermometer; 10 °F too high and you’ll sacrifice the fudgy center.

Chill for clean cuts

After cooling, refrigerate 30 minutes. A sharp chef’s knife dipped in hot water will glide through the swirl without smearing.

Go light on the swirl

Too much PB insulates the batter and causes under-baked centers. Stick to ⅔ cup max for a 9×13 pan.

Double-batch trick

Bake in two pans rather than one deeper pan; thicker batter takes exponentially longer and dries out the edges.

Variations to Try

Storage Tips

Room-temperature brownies stay luscious for 3 days—wrap the pan tightly with plastic wrap or transfer squares to an airtight container with parchment between layers. To extend freshness, slip a slice of bread into the container; the bread sacrifices its moisture first, keeping your brownies supple.

Refrigeration isn’t mandatory, but it does intensify the fudge factor. Chill up to 1 week, then bring to room temp for 20 minutes before serving so the peanut butter softens. For longer storage, freeze individual squares: wrap each in plastic, then foil, and stash in a zip-top bag up to 3 months. Thaw overnight in the fridge or 30 minutes at room temp. Warm in the microwave for 8–10 seconds for that just-baked gooeyness.

Frequently Asked Questions

Yes, but stir in 1 teaspoon melted coconut oil to prevent separation. Expect a slightly grittier swirl and a less pronounced salty-sweet hit.

Over-mixing after adding flour develops gluten, and too much baking time dries the crumb. Fold just until the flour disappears and pull them when the edges firm but the center jiggles slightly.

Absolutely. Halve all ingredients and bake in an 8×8-inch pan for 22–25 minutes. Check doneness early—thicker batter takes longer, but smaller volume bakes faster.

Dissolving sugar into hot browned butter is key. You can also whisk the batter vigorously for 30 seconds after adding eggs to create a meringue-like surface that crackles as it bakes.

No, but it deepens chocolate flavor without a coffee taste. If omitted, add ½ teaspoon extra vanilla for complexity.

Oil yields softer, less flavorful brownies and prevents the crackly top. Stick with browned butter for best results, or use ⅔ cup neutral oil plus 2 tablespoons water if dairy-free.

Indulgent Chocolate Peanut Butter Brownies with Sea Salt

Ingredients You'll Need