Mocha Custard Brownie Bars

Mocha Custard Brownie Bars are an indulgent layered dessert featuring a rich chocolate brownie base topped with a smooth, coffee-infused custard layer. With their perfect balance of chocolate and espresso flavors, these bars are ideal for coffee lovers and dessert enthusiasts alike.

Why You’ll Love This Recipe

These bars combine the fudgy goodness of brownies with the silky texture of mocha custard, offering an elegant upgrade to a classic treat. They’re perfect for make-ahead desserts, potlucks, or whenever you want a sophisticated twist on traditional brownies. The contrast of textures and flavors makes each bite deeply satisfying.

ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

• All-purpose flour
• Unsweetened cocoa powder
• Granulated sugar
• Eggs
• Unsalted butter (melted)
• Dark chocolate (chopped or chips)
• Vanilla extract
• Instant espresso powder
• Whole milk
• Heavy cream
• Cornstarch
• Egg yolks
• Powdered sugar (for dusting, optional)

directions

1. Preheat the oven to 350°F (175°C). Line an 8×8 inch baking pan with parchment paper.
2. For the brownie base, whisk together melted butter and sugar. Add eggs and vanilla, then mix in cocoa powder and flour until just combined. Stir in chocolate pieces.
3. Pour batter into the prepared pan and bake for 20–22 minutes. Let cool completely.
4. For the mocha custard, whisk egg yolks, sugar, and cornstarch in a bowl until smooth.
5. In a saucepan, heat milk, cream, and espresso powder until simmering. Slowly pour into the yolk mixture, whisking constantly.
6. Return mixture to the saucepan and cook over medium heat until thickened, about 5 minutes.
7. Remove from heat and stir in vanilla. Let cool slightly before pouring over the brownie base.
8. Smooth the custard evenly over the brownie layer. Chill in the refrigerator for at least 4 hours, or until fully set.
9. Slice into bars and dust with powdered sugar before serving, if desired.

Servings and timing

Makes 12 bars. Preparation time is 25 minutes, baking time is 22 minutes, plus at least 4 hours for chilling and setting.

Variations

• White Chocolate Custard: Replace dark chocolate with white chocolate and omit espresso for a vanilla twist.
• Nutty Addition: Add chopped hazelnuts or walnuts to the brownie layer.
• Boozy Option: Add a splash of coffee liqueur to the custard for an adult-friendly version.
• Gluten-Free: Use a gluten-free flour blend for the brownie layer.

storage/reheating

Store the bars in an airtight container in the refrigerator for up to 5 days. These bars are best served chilled. Freezing is not recommended due to the custard texture. Reheating is not necessary.

FAQs

Can I use brewed coffee instead of espresso powder?

Yes, but reduce the milk slightly to avoid thinning the custard too much.

How do I know the custard is thick enough?

It should coat the back of a spoon and hold shape when stirred.

Can I use a brownie mix for the base?

Yes, a boxed brownie mix can be used for convenience. Let it cool completely before adding the custard.

Can I make this without eggs?

You can use egg replacers for the brownie, but the custard relies on egg yolks for structure and texture.

Why is my custard lumpy?

It may have cooked too quickly. Strain through a fine sieve to remove lumps.

How long does it take for the custard to set?

At least 4 hours in the refrigerator, or overnight for best results.

Can I make these ahead of time?

Yes, they are perfect for making a day in advance.

What size pan should I use?

An 8×8 inch square pan works best for even layering and easy slicing.

Should I cover the custard while chilling?

Yes, place plastic wrap directly on the custard surface to prevent a skin from forming.

Can I add chocolate ganache on top?

Yes, a thin layer of ganache adds a decadent finish.

Conclusion

Mocha Custard Brownie Bars are a deliciously refined take on a classic dessert. The combination of rich chocolate brownie and silky mocha custard creates a sophisticated flavor profile that’s sure to satisfy. Whether for entertaining or a quiet indulgence, these bars are an elegant and memorable treat.

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