Instructions

         Prepare the Cake

• Preheat oven to 350°F (175°C). Grease and flour a 9×13 inch baking pan.
• In a large bowl, combine the cake mix and pudding mix.
• In a separate bowl, whisk together eggs, vanilla, oil, sour cream (or buttermilk), and coffee.
• Gradually add wet ingredients to dry ingredients, mixing until just combined.
• Fold in chocolate chips.
• Pour batter into the prepared pan and bake 45 minutes, or until a toothpick inserted comes out clean. Cool completely before frosting.

        Make the Ganache Frosting

• Melt butter in a saucepan over low heat.
• Whisk in cocoa powder, powdered sugar, vanilla, milk, and walnuts.
• Simmer gently, stirring until smooth and glossy.
• Let cool slightly before spreading over cooled cake.

          Serve

• Slice and serve warm or at room temperature.
• For extra indulgence, add a scoop of vanilla ice cream or a dollop of whipped cream.