Cake adapted from The Taste of Oregon cookbook.Frosting: Use immediately or cover tightly and store for up to 1 week in the refrigerator. Also optional to freeze up to 4 months.
Preheat oven to 350 degrees. Combine and mix well buttermilk, oil, and eggs. Set aside.
In a separate bowl, sift together flour, sugar, soda, salt. Add cocoa.
Combine liquid and dry ingredients, alternating with cup of coffee. Beat well.
Bake at 350 degrees in a greased and floured 9“ x 13” pan for 35-40 minutes. Cool for 30-40 minutes.
For the frosting:
Beat the butter on medium speed for 2 minutes. Add powdered sugar, cocoa, heavy cream, and vanilla extract. Beat on low speed for 30 seconds, then increase to high speed and beat for 1 full minute. If needed, add extra powdered sugar or cocoa powder if frosting is too thin. Or, you can add a few drops of heavy cream if frosting is too thick.
Frost the cake immediately (after cooling time), or cover the cake tightly and store.
The frosting keeps for up to 1 week in the refrigerator or up to 4 months in the freezer.