Add the powdered sugar and maple syrup and beat again until well combined.
If you aren't going to decorate the cake right away refrigerate the cream.
Place the bottom layer of the cake on a cake stand or plate, flat side up.
Use just under half of the frosting and spread it all over. Use a palette knife or a knife and if you have trouble spreading it without breaking the cake up, dip the knife in a glass of water before spreading then try again.
Put on the top layer of the cake, this time flat side down, rounded side up.
Use the remaining frosting to cover the top and sides of the cake.
Scatter a few chopped walnuts on top for decoration.
If you wish to cook this cake as a single layer halve the ingredients then follow the rest of the instructions as directed. Cooking time remains the same. If you decide to cook in a loaf pan (half of this recipe fits well in a 8.5inch x 4.5inch loaf pan) then the cooking time will increase to around 50 minutes to one hour. Check with a tooth pick or a skewer. it should come out clean when inserted into the middle of the cake.