Prepare the yellow cake mix according to package instructions. Combine it with the eggs, vegetable oil, and water. Bake in a preheated oven at 350°F for about 32 minutes or until a toothpick inserted comes out clean.

Cool the cake slightly after baking. Remove it from the oven and let it rest for about 10 minutes.

Poke holes in the top of the cake using a fork or a skewer.

Mix the strong brewed coffee and Kahlua in a separate mixing bowl. Stir gently until combined.

Pour the coffee mixture over the cake, aiming for those holes you've poked.

Cool completely. Allow the cake to rest for a full hour at room temperature.

Whip together the unsalted butter and granulated sugar in a separate bowl until creamy and smooth.

Fold in the whipped topping gently until well combined.

Spread the whipped topping mixture evenly over the cooled cake.

Garnish with chocolate shavings, crushed nuts, and coffee beans based on your personal preference.