Prepare the chocolate cake layers: Preheat the oven to 350°F (175°C). Grease and flour two 9-inch round cake pans. Sift together the flour, sugar, cocoa powder, baking powder, baking soda, and salt. Add the eggs, milk, oil, and vanilla, and mix until smooth. Gradually add the boiling water, mixing until well combined. The batter will be thin. Divide evenly between the pans.

Bake the cakes: Bake for 30-35 minutes or until a toothpick inserted into the center comes out clean. Cool the cakes in the pans for 10 minutes, then transfer to a wire rack to cool completely.

Make the banana cream filling: Beat the cream cheese and butter until smooth. Add powdered sugar and vanilla, and continue beating. In a separate bowl, whip the heavy cream to stiff peaks, then fold it into the cream cheese mixture. Finally, fold in the mashed bananas.

Assemble the cake: Place one cooled cake layer on a platter. Spread a generous layer of banana cream filling on top. Add the second cake layer, gently pressing it down. Frost the entire cake with the remaining banana cream filling.

Garnish and serve: Top with banana slices and chocolate shavings. Chill for at least 2 hours before serving.

Enjoy: Slice and serve this irresistible Choco-Banana Dream Layers cake to delight your guests.