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Sturdy Peanut Butter Swirl Brownies

Source: americastestkitchen.com

TL;DR

America's Test Kitchen shares a recipe for moist chocolate brownies swirled with peanut butter that hold together when cut.
Uses 3 ounces unsweetened chocolate, ⅔ cup flour, and ⅓ cup peanut butter for 16 brownies baked in an 8-inch pan.
Baking powder creates sturdy texture without crumbling, ideal for lunches, picnics, or home with optional chocolate frosting.

The story at a glance

America's Test Kitchen developed peanut butter swirl brownies that stay moist and fudgy with rich chocolate flavor while resisting crumbling for easy slicing and transport. The recipe calls for melting unsweetened chocolate with butter, mixing in eggs and a bit of baking powder for structure, then swirling in peanut butter before baking. It's designed for everyday use like lunchboxes or bake sales, with an optional chocolate frosting for extra indulgence.

Key points

Ingredients for brownies: 3 ounces chopped unsweetened chocolate, 8 tablespoons unsalted butter, 1 cup sugar, ½ teaspoon baking powder, ¼ teaspoon salt, 2 large eggs, 1 teaspoon vanilla, ⅔ cup all-purpose flour, ⅓ cup room-temperature peanut butter (creamy or chunky).
Optional frosting: 4 ounces semisweet or bittersweet chocolate and 1 tablespoon vegetable oil.
Bake in foil-lined, greased 8-inch pan at 350°F for 22-27 minutes, until toothpick halfway between edge and center comes out clean.
Swirl peanut butter in 10 dollops with a paring knife just before baking to create patterns.
Total time: 1¼ hours plus 1 hour cooling (longer with frosting); yields 16 2-inch squares, storable for days.
Baking powder gives cakey yet sturdy texture; unsweetened chocolate boosts flavor without sweetness overload.

Details and context

The recipe avoids old-fashioned peanut butters with separated oil for consistent results. Melting chocolate and butter separately ensures even incorporation, and whisking wet ingredients first prevents overmixing flour, which could toughen the batter.

A clean toothpick edge but moist center signals perfect doneness—overbaking dries them out. Science behind it: baking powder aerates for sliceable structure, while minimal flour keeps them fudgy.

Optional frosting adds decadence: melt chocolate with oil for smooth spreadability that sets firm. These brownies suit packing since they won't fall apart, unlike fragile fudgier versions.

Key quotes

None.

Why it matters

These brownies deliver reliable chocolate-peanut butter satisfaction without the common crumbling issue that ruins portability. Home bakers get sturdy, flavorful results for school lunches, picnics, or sharing, saving time on trial-and-error testing. Watch for peanut butter brand consistency and toothpick doneness to replicate success.