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Ingredients

• 12 tablespoons (1 1/2 stick or 6 ounces) unsalted butter, cut into cubes
• 8 ounces Valrhona Lact (41% cocoa) / milk chocolate, coarsely chopped
• 8 ounces Valrhona Grand Cru Noir Manjari (64% cocoa) / dark milk chocolate, coarsely chopped
• 1 1/2 cup granulated sugar
• 4 large eggs, room temperature
• 2 tablespoons vanilla
• 1/2 cup all-purpose flour, sifted
• 1 teaspoon fleur de sel or sea salt
• 1 tablespoon instant coffee powder
• 3 ounces dark chocolate, cut into large chunks (optional)
• Softened butter, cocoa powder for dusting pan
• 

Description

Serious Eats