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["Heat oven to 350u00b0F (176u00b0C). Arrange two racks in center of oven. Butter three 8-by-2-inch round cake pans; line bottoms with parchment. Dust bottoms and sides of pans with cocoa powder; tap out any excess.", "Attach Sifter Attachment to KA Stand Mixer (with Beater Attachment), and press ""Tare"" to zero scale.", "Add cocoa powder into the ingredient hopper and weigh. Turn Stand Mixer to speed 4 and sift cocoa into a medium bowl, and whisk in boiling water. Set aside to cool.", "Cream butter on speed 2 until light and fluffy.", "Add sugar to ingredient hopper and weigh. Turn Stand Mixer to ""stir"" and gradually sift in sugar until light and fluffy, 3 to 4 minutes, scraping down sides twice. Beat in vanilla. Drizzle in eggs, a little at a time, beating between each addition until the batter is no longer slick, scraping down the sides twice.", "Whisk milk into reserved cocoa mixture.", "Add and weigh flour, baking soda, and salt to ingredient hopper, pressing ""Tare"" between the addition of each ingredient. Give hopper ingredients a stir to combine. With mixer on ""stir"
