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Preheat oven to 350 degrees. Line 2 standard muffin tins with paper liners. Whisk together flour, cocoa powder, sugar, baking soda, baking powder, and salt in a medium bowl.
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Mix in eggs, water, buttermilk, oil, and vanilla until smooth, about 3 minutes. Divide batter evenly among prepared muffin tins. Bake, rotating tins halfway through, until tops spring back when lightly touched, about 20 minutes. Let cool in tins on wire racks.
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Before serving, place a stencil atop each cupcake, and dust with confectioners' sugar. Carefully remove stencil.