Peanut Butter Swirl Fudgy Brownies
Dense, fudgy chocolate brownies with creamy peanut butter ribbons running through. Rich cocoa flavor deepened by espresso, balanced by sweet peanut butter marbling. The coffee enhances chocolate without adding coffee taste. Serve slightly chilled as an afternoon treat or dessert. This version prioritizes fudgy texture with optional espresso depth and decorative peanut butter swirls that create visual appeal and flavor contrast.
Ingredients
- 10 tablespoon unsalted butter, melted
- 2 large egg
- 1 cup granulated sugar
- ¼ cup light brown sugar, packed
- 2 tablespoon brewed coffee(optional)hot water1:1coffee
removes coffee flavor enhancement but maintains moisture
- 1 teaspoon vanilla extract
- ¾ cup plus 2 tablespoon unsweetened cocoa powder, natural or Dutch-processDutch-process cocoa powder1:1cocoa
adds deeper chocolate flavor and slightly less acidic taste
Full guide → - 1 teaspoon instant espresso granules(optional)
- ¼ teaspoon salt(optional)
- ½ cup all-purpose flourcake flour0.875:1 (reduce by 12.5%)flour
creates softer crumb
- ¼ cup creamy peanut butter, melted
Instructions
- 1
Preheat oven to 350F. Line an 8-by-8-inch baking pan with foil, leaving overhang on sides, and spray with cooking spray.
- 2
Melt butter in a microwave-safe bowl on high power, then cool slightly.
- 3
Whisk in eggs, both sugars, coffee, and vanilla until combined.
- 4
Whisk in cocoa powder, espresso granules, and salt, whisking vigorously to remove lumps.
- 5
Stir in flour until just combined, avoiding overmixing.
- 6
Pour batter into prepared pan.
- 7
Melt peanut butter in a microwave-safe bowl on high power.
- 8
Drizzle melted peanut butter across batter in 5 evenly spaced parallel lines spanning the pan length.
- 9
Rotate pan 90 degrees. Using a toothpick, drag 4 to 5 evenly spaced lines perpendicularly through the peanut butter to create marbling.
- 10
Bake until a toothpick inserted in center comes out mostly clean with a few moist crumbs.
- 11
Cool in pan for 1 hour, then lift out using foil overhang and slice.
Tips
Cool melted butter slightly before adding eggs to prevent scrambling. Whisk cocoa vigorously to eliminate lumps for smooth batter texture.
Don't overbake; the toothpick test is key. Brownies continue cooking slightly as they cool, so slight moistness is desired.
Store in fridge and serve slightly chilled for the best fudgy texture and flavor intensity.
Good to Know
Airtight container at room temperature for 3 days, refrigerator for up to 1 week, or freezer for up to 6 months.
Batter can be prepared up to 4 hours ahead and refrigerated before marbling and baking. Baked brownies freeze well; thaw at room temperature or serve straight from freezer.
Serve slightly chilled at room temperature or from refrigerator. Cut into 9 or 16 squares depending on desired size.
Common Mistakes
Overmix flour to avoid dense, tough brownies
Don't skip cooling melted butter to avoid scrambled eggs
Overbake to avoid dry texture; aim for moist crumbs on toothpick
Substitutions
adds deeper chocolate flavor and slightly less acidic taste
Full guide →removes coffee flavor enhancement but maintains moisture
FAQ
Can I use natural peanut butter instead of creamy?
Yes, with the same ratio. Natural peanut butter works identically for swirling. Stir any separated oil back in before melting for consistent drizzle consistency.
What if I don't have espresso granules?
Omit them. The espresso is optional. Coffee already in the batter provides depth. Without espresso, brownies will taste slightly less intensely chocolatey but remain delicious.
How long do baked brownies keep?
Room temperature: 3 days. Refrigerator: up to 1 week. Freezer: up to 6 months. Store in airtight container. Thaw frozen brownies at room temperature or serve cold straight from freezer.