Preheat oven 350ºF. Grease and flour (ideally using cocoa powder – see note) two 9-inch baking pans and line them with circles of parchment paper.
In large bowl of stand mixer, combined flour, sugar, cocoa, baking soda & salt on low speed for one minute.
Add eggs, buttermilk, melted butter and vanilla extract and beat on medium speed until dough comes together, about 30 seconds. Pause to scrape the sides and bottom of the mixer bowl and paddle. Beat 15 sec more, until mix is almost smooth.
Remove the bowl from the mixer and stir in the hot coffee with a rubber spatula.
Pour the batter evenly between the two pans and bake on the middle rack of the oven for 25 to 35 minutes, until a thermometer inserted in the center registers 190ºF.
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