– 1 cup unsalted butter cut into small cubes (2 sticks; 230 grams) – ¼ cup unsweetened natural cocoa powder (22 grams) – ¾ cup water (180 ml) – 2 cups all-purpose flour spooned and leveled (250 grams) – 2 cups granulated sugar (400 grams) – 1 teaspoon baking soda – ½ teaspoon salt – ½ cup buttermilk at room temperature (120 ml)
– ¼ cup sour cream or plain Greek yogurt at room temperature (60 grams) – 2 large eggs at room temperature – 1 teaspoon pure vanilla extract
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