Preheat the oven to 350°F. Line three 6-inch cake pans with parchment paper.
In a large mixing bowl, add the butter, cane sugar, and dark brown sugar.
Mix on low until combined and there are no chunks of butter.
Add the eggs and bananas. Mix on low until combined.
Add the heavy cream, cake flour, cinnamon, baking powder, salt, and cloves.
Mix on low until combined and no dry bits of flour remain.
Transfer the cake batter to the prepared baking pans. They should weigh about 250 grams each.
Bake for 20 to 22 minutes or until a toothpick inserted in the center comes out clean. Allow to cool completely in the cake pans.
To make the frosting: In the bowl of a stand mixer fitted with the paddle attachment, add the butter, powdered sugar, and heavy whipping cream (start with less, add more as needed).
Mix on low until combined, then speed the mixer up to high and whip until it's light and fluffy, about 2 to 3 minutes. Be sure to scrape down the sides of the bowl part way through mixing to ensure a smooth, creamy frosting.
Remove the cakes from the cake pans. Place a dollop of frosting onto your cake turntable, cake plate, or cake board and place the first cake layer bottom side down (this ensures it's flush with what you're serving it on).
Using a cake spatula, add about a third of the frosting and spread it out evenly. Top with the second cake layer, bottom side up (this helps the cake look straight).
Add another third of frosting, spread evenly. Top with the last cake layer (bottom side up).
Add a small amount of frosting on top to crumb coat the top of the cake.
Transfer the remaining frosting to a piping bag and cut a small hole.
Using the piping bag, pipe frosting and fill in the gaps in the frosting layers so the frosting is bulging out of the frosting layers.
Add remaining frosting on top.
Using a cake spatula (tip: run it under hot water to help smooth the frosting), smooth the top of the cake.
Using a bench scraper, or your cake spatula again, smooth the sides of the cake. The trick here is to only go around the cake once or twice to remove excess frosting from the frosting layers. You don't want to completely coat the cake in frosting, as then it will just look crumb coated.
Top with fresh banana slices, chopped walnuts and butterscotch sauce. This part is totally optional, but I love this topping!