Servings: 12 to 16
1 cup (2 sticks) butter, at room temperature, plus more for greasing the pans
2 cups (8 1/2 ounces) flour, divided
3/4 cup Dutch-process cocoa
1 cup boiling water
1 1/2 cups sugar
2 teaspoons vanilla
1 tablespoon baking powder
3/4 teaspoon salt
1. Heat the oven to 350 degrees. Generously grease the interior of two (9-inch) round cake pans, bottom and sides, with butter. If possible, line the bottom with parchment paper and grease the paper as well.
2. Sprinkle about 2 teaspoons flour into each pan and shake around until the interior is thoroughly dusted. Turn the pans upside down over the sink and tap against the sink to dislodge any excess flour.
3. In a small bowl, stir the cocoa into the boiling water, stirring until smooth. Set aside until it cools to room temperature.
4. Meanwhile, in the bowl of a stand mixer, or in a large bowl using an electric mixer, beat the 1 cup butter until fluffy, 1 to 2 minutes.
5. Reduce the speed and add the sugar with the mixer running, continuing to mix until light and fluffy, 2 to 3 minutes more. Add the eggs one at a time and beat into the mixture, then add the vanilla and mix until combined.
6. In a large bowl, combine the remaining flour with the baking powder and salt, stirring with a whisk or fork until combined.
7. Add one-third of the cocoa to the butter mixture and beat until combined, then one-third of the flour mixture. Repeat with the remaining cocoa and flour in two batches.