Preheat the oven to 350 degrees F. Butter the sides and
bottom of a 9×13-inch glass or light-colored baking pan.
Line the pan with parchment paper.
In a medium bowl, whisk the flour, salt, and cocoa powder
together.
Put the chocolate, butter and instant espresso powder in a
large bowl and set it over a saucepan of simmering water,
stirring occasionally, until the chocolate and butter are
completely melted and smooth. Turn off the heat, but keep
the bowl over the water and add the sugars. Whisk until
completely combined, then remove the bowl from the pan.
The mixture should be room temperature.
Add 3 eggs to the chocolate mixture and whisk until
combined. Add the remaining eggs and whisk until
combined. Add the vanilla and stir until combined. Do not
overbeat the batter at this stage or your brownies will be
cakey.
Sprinkle the flour mixture over the chocolate mixture.
Using a rubber spatula (not a whisk), fold the flour mixture
into the chocolate until just a bit of the flour mixture is
visible.
Pour the batter into the prepared pan and smooth the top.
In a medium bowl, whisk together all of the peanut butter
swirl ingredients. Using a spoon, place dollops of the
peanut butter mixture all over the top of the brownie
batter. Using a butter knife, swirl the chocolate and peanut
butter, running the knife crosswise and lengthwise through
the batters.
Bake in the center of the oven for 30 minutes, rotating the
pan halfway through the baking time, until a toothpick
inserted into the center of the brownies comes out with a
few moist crumbs sticking to it. Let the brownies cool
completely, then lift them out of the pan using the
parchment paper. Cut into squares and serve.
Store at room temperature in an airtight container or wrap
with plastic wrap for up to 3 days.
Originally Submitted
10/10/2012
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