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Export 9 ingredients for grocery delivery
Step 1
Preheat oven to 350 degrees F. Coat a 9-inch round cake pan with cooking spray. Line the pan with a circle of wax paper.
Step 2
Whisk flour, granulated sugar, cocoa, baking powder, baking soda and salt in a large bowl. Add buttermilk, brown sugar, egg, oil and vanilla. Beat with an electric mixer on medium speed for 2 minutes. Add hot coffee and beat to blend. (The batter will be quite thin.) Pour the batter into the prepared pan.
Step 3
Bake the cake until a skewer inserted in the center comes out clean, 30 to 35 minutes. Cool in the pan on a wire rack for 10 minutes; remove from the pan, peel off the wax paper and let cool completely. Dust the top with confectioners' sugar before slicing.