1. Prepare the Cake Layers:

Preheat oven to 350°F (175°C). Grease and line two 9-inch round cake pans.
In a large bowl, sift together the flour, sugar, cocoa powder, baking powder, baking soda, and salt.
In another bowl, whisk eggs, buttermilk, vegetable oil, and vanilla extract until smooth.
Gradually add the wet ingredients to the dry ingredients. Mix until just combined.
Slowly stir in the coffee (batter will be thin).
Divide the batter evenly between the prepared pans.
Bake for 30-35 minutes or until a toothpick inserted into the center comes out clean.
Let the cakes cool completely.
2. Make the Baileys Frosting:

Beat the butter until creamy.
Gradually add powdered sugar, cocoa powder, and espresso powder.
Mix in Baileys Irish Cream until the frosting is fluffy and spreadable.
3. Assemble the Cake:

Place one cake layer on a serving plate and spread a generous amount of frosting.
Add the second cake layer and frost the top and sides evenly.
Drizzle melted chocolate over the cake and decorate with chocolate shavings and coffee beans.
4. Serve:
Slice and serve with a glass of Baileys or a hot coffee for the ultimate indulgence.

Tips:
Use decaf coffee if you prefer a milder caffeine kick.
For extra Baileys flavor, brush the cake layers with a mix of Baileys and sugar syrup.