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Preheat your oven to 350 degrees and grease two 8 inch round cake pans. Optionally line the pan with parchment paper and set aside. In a large bowl, whisk together the flour, sugar, baking soda, and salt.
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In a microwave safe medium bowl, melt the butter until just melted in the microwave, about 2 minutes. Then add in the coffee and microwave for another minute, or until the mixture is just boiling. Stir in the cocoa powder and whisk to combine until smooth.
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Pour the hot chocolate mixture over the dry ingredients, and whisk until combined- the mixture will be very thick at this point, and it doesn’t have to be fully mixed through.
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Then stir in the buttermilk, eggs, and vanilla extract and whisk until combined and smooth. Pour the batter into your prepared cake pans, and bake for 30-32 minutes, or until a toothpick comes out with just a few crumbs clinging to it. Cool the cake completely before frosting it. Optionally, remove the cakes from the pans while hot and wrap tightly in plastic wrap, allowing the cakes to cool at room temp while wrapped.