Preheat the oven to 350 degrees F. Butter two 8-inch round cake pans. Line with parchment paper, then butter and flour the pans (I use Pam for Baking cooking spray and also use Evenbake Cake Strips around the pans to ensure even baking).
Sift the flour, sugar, cocoa, baking soda, baking powder, and salt into the bowl of an electric mixer fitted with a paddle attachment and mix on low speed until combined.
In another bowl, combine the buttermilk, oil, eggs, and vanilla.
With the mixer on low speed, slowly add the wet ingredients to the dry. With mixer still on low, add the coffee and stir just to combine, scraping the bottom of the bowl with a rubber spatula.
Pour the batter into the prepared pans and bake for 35 to 40 minutes, until a cake tester comes out clean. Cool in the pans for 30 minutes, then turn them out onto a cooling rack and cool completely.
If not frosting immediately, wrapped cooled cakes in plastic wrap then place each in a large resealable plastic bag and in the refrigerator until ready to use.