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Ingredients (12)
- 6 tablespoons (85 grams) unsalted butter, at room temperature
- 3/4 cup (145 grams) firmly packed dark-brown sugar
- 2 tablespoons (25 grams) granulated sugar
- 1 large egg
- 1 large egg yolk
- 1 teaspoon vanilla extract
- 3/4 cup (175 ml) buttermilk
- 3/4 teaspoon baking soda
- 3/4 teaspoon baking powder
- 1/2 teaspoon table or fine sea salt
- 1/3 cup (40 grams) Dutch-process cocoa powder
- 1 cup (130 grams) all-purpose flour
Step 1 of 3
Heat the oven to 350 degrees. Coat an 8-inch square cake pan with nonstick spray and line the bottom with parchment paper.