These congo bars are the perfect marriage of blondie and brownie. Two types of brownies sandwiched together and topped with a ganache drizzle. Yum!

Have you experienced the joy of the Congo Bar?

If not, let me tempt you by saying it is the perfect marriage of blondie and brownie. Two variations of decadent and chewy brownies sandwiched together with nuts (or not!) and topped with a ganache drizzle.

A white platter with chocolate congo bars with a chocolate drizzle on top.

I don’t claim to have much self-control when it comes to eating most things (except for kalamata olives and chickpeas – I can resist them, easy), but that was never more evident than with these congo bars.

I nearly had to have my kids tie my hands behind my back to keep me from picking off another bite and another and another. Good thing they don’t know how to tie knots effectively yet.

To throw a quick vote in favor of the nuts, I am usually in the no-nuts-in-my-brownie camp but used them in this recipe because I wanted to be open-minded and everything.

I think…just maybe…quite possibly…I’ve been converted to loving nuts in my brownies. Or at least in my congo bars.

They provided the perfect amount of nutty crunch in between the dense, mouth-watering layers.

A square bar with a blondie base, brownie top, and ganache drizzle.

One Year Ago: Honey Lime Fruit Salad
Two Years Ago: My Favorite Cookie
Three Years Ago: Honey Mustard Chicken

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Congo Bars

4 stars (2 ratings)


Congo Layer:

  • 1 ⅓ cups (189 g) all-purpose flour
  • teaspoons baking powder
  • ¼ teaspoon salt
  • 3 ounces ¾ stick butter, melted and cooled
  • cups (265 g) firmly packed light brown sugar
  • 1 large egg
  • 1 large egg white, save the egg yolk for the brownie layer
  • 1 teaspoon pure vanilla extract
  • 1 cup chopped walnuts

Brownie Layer:

  • 1 cup plus 2 tablespoons, all-purpose flour
  • ¼ cup (21 g) unsweetened cocoa powder
  • teaspoon baking powder
  • ¼ teaspoon salt
  • ½ cup (113 g) butter
  • 4 ounces (113 g) semisweet chocolate, coarsely chopped
  • ¾ cups (159 g) granulated sugar
  • 2 large eggs, lightly beaten
  • 1 large egg yolk
  • 2 teaspoons pure vanilla extract

Ganache Drizzle:

  • 3 ounces (85 g) semisweet chocolate, finely chopped
  • 3 tablespoons heavy cream


  • Center a rack in the oven and preheat the oven to 350 degrees F. Line a 9X13-inch pan with foil and lightly grease and flour (I like to use Baker’s Joy to make the greasing/flouring part easier).
  • For the congo layer: in a small bowl, stir together the flour, baking powder, and salt. In a large bowl, stir together the butter, brown sugar, egg, egg white, and vanilla just until blended. Stir in the flour mixture just until the batter is smooth.
  • Scoop the thick, sticky batter onto 8 or 9 different areas on the bottom of the prepared pan. With an offset spatula or rubber spatula, spread the batter to cover the pan as evenly as possible. Sprinkle the walnuts evenly on top and gently press them into the batter.
  • Partially bake the layer until it is no longer shiny on top and is beginning to come away from the sides of the pan, about 12-15 minutes (it will continue baking with the brownie layer). Transfer the pan to a wire rack to cool while you prepare the brownie layer.
  • For the brownie layer: in a small or medium bowl, stir together the flour, cocoa powder, baking powder, and salt. In a small saucepan, melt the butter and chocolate over very low heat, stirring with a silicone spatula until smooth. Or, combine in a medium microwave-safe bowl and melt in a microwave oven at 50 percent power (medium) for 30-second bursts, stirring after each burst, until melted, 1 to 1½ minutes. Transfer to a medium bowl and let cool for 5 minutes.
  • Stir the sugar into the chocolate mixture until incorporated. Add the eggs, egg yolk, and vanilla and stir until well blended. Stir in the flour mixture just until the batter is smooth. Scoop the thick, sticky batter onto 8 or 9 different areas of the still-warm congo layer. With the offset spatula, spread the batter as evenly as possible.
  • Bake the brownie until the top is no longer shiny; appears set; feels firm, rather than soft; and a round wooden toothpick inserted in the center comes out with moist chocolate crumbs attached, about 20 minutes. Transfer the pan to a wire rack and let cool completely. The top layer will set up as it cools.
  • To make the ganache drizzle: place the chocolate in a medium bowl. In a small saucepan, bring the cream just to a boil over medium heat. Pour the cream over the chocolate and let it stand for 30 seconds. Whisk together until smooth and creamy. Set the mixture aside at room temperature just until it cools a bit and begins to thicken slightly.
  • Pour the warm glaze into a small ziploc bag. Snip a small opening at one of the corners to allow a thin flow of glaze. Squeezing lightly, pipe thin lines of chocolate in a zigzag pattern over the cooled surface of the brownie. Set aside at room temperature until the glaze is set, 1 to 1½ hours.
Serving: 1 Bar, Calories: 273kcal, Carbohydrates: 33g, Protein: 4g, Fat: 15g, Saturated Fat: 7g, Cholesterol: 52mg, Sodium: 149mg, Fiber: 2g, Sugar: 21g

Recipe Source: adapted slightly from Flo Braker’s Baking for All Occasions