Preheat oven to 350º Fahrenheit.
Grease and flour two 9-inch round cake pans.
In large bowl combine flour, sugar, cocoa, baking soda, baking powder and salt.
Make a well in the center.
Add eggs, coffee, buttermilk, oil and vanilla.
Beat for 2 minutes on medium speed. Batter will be thin.
Pour into prepared pans.
Bake for 32 to 36 minutes, or until toothpick inserted into center of cake comes out clean.
Cool for 10 minutes, then remove cakes from pans and move them to a wire cooling rack.
Once cooled, prepare frosting by mixing it with 6-8 drops of neon green food coloring.
Fill and frost with buttercream frosting.
Add sprinkles on top.