Peanut Butter Cookie Brownie Bars
Two-layer baked bars combining chewy peanut butter cookies with rich fudgy brownies. Brown sugar and peanut butter create a nutty, slightly sweet base that contrasts beautifully with the dense chocolate layer on top. Semi-sweet or dark chocolate chips meld into a glossy topping when combined with butter and sugar. Serve at room temperature or slightly warm with milk or coffee. This version uses the straightforward layer method, baking both components together for unified texture rather than separately.
Ingredients
- 1 cup brown sugar, firmly packed
- ½ cup butter, softened
- ½ cup peanut butter
- 1 large egg
- 1 teaspoon vanilla extract
- 1 ½ cups all-purpose flourgluten-free 1-to-1 blendequalfor celiacgluten-free
medium
- ½ teaspoon baking powder
- ½ teaspoon baking soda
- ½ teaspoon salt
- 1 ½ cups sugar
- ⅝ cup butter
- ¼ cup water
- 2 cups semi-sweet or dark chocolate chips
- 1 tablespoon vanilla extract
- 4 large eggs
Instructions
- 1
Heat oven to 350°F and line a 13x9-inch pan with parchment paper.
- 2
Beat brown sugar, butter, and peanut butter until creamy. Add egg and vanilla, mixing well.
- 3
Fold in flour, baking powder, baking soda, and salt until just combined.
- 4
Press dough evenly into prepared pan.
- 5
Combine sugar, butter, and water in a saucepan over medium heat, stirring until it boils.
- 6
Remove from heat and stir in chocolate chips and vanilla until chocolate melts completely.
- 7
Cool for 5 minutes, then add eggs one at a time, whisking after each addition.
- 8
Stir in flour, baking soda, and salt until just combined.
- 9
Pour chocolate batter over peanut butter layer.
- 10
Bake 40-45 minutes until a toothpick inserted in center shows moist crumbs.
- 11
Cool completely before serving.
Tips
Let chocolate mixture cool 5 minutes before adding eggs to prevent cooking them. Whisk after each addition for silky texture.
Press peanut butter dough firmly and evenly into pan so it bakes uniformly without gaps where brownie can seep through.
Moist crumbs on the toothpick indicate doneness; overbaking will dry out the brownie layer.
Good to Know
Cover and refrigerate up to 5 days. Room temperature storage acceptable for 2 days in cool conditions.
Assemble and bake up to 1 day ahead. Do not freeze unbaked layers.
Cool completely, cut into squares, serve at room temperature or gently warmed.
Common Mistakes
Do not skip cooling the chocolate mixture to avoid scrambled eggs in brownie layer.
Do not overbake; pull at 40 minutes first to check, as residual heat continues cooking.
Do not press peanut butter layer too thin or brownie will sink through during baking.
Substitutions
Gluten-Free Swaps
medium
Nut-Free Alternatives
General Alternatives
FAQ
Can I use natural peanut butter instead of conventional?
Yes, but stir oil back in if separated. Natural butter may alter binding slightly; add 1 tablespoon flour to cookie dough if mixture feels loose.
What if my toothpick comes out clean instead of with moist crumbs?
Remove immediately; the bars are done and further baking will dry them. Brownies should retain some fudginess, not cake texture.
How long can I keep these bars and can I freeze them?
Refrigerated, up to 5 days. Freezing not recommended as texture becomes grainy when thawed. Best served fresh or within 2 days at room temperature.