60th birthday cake

I needed something quickly and it wasn't expensive, so this cake was made.

Preparation steps

Bake the biscuit. When it cools, cut it in half.
Cook all the ingredients for the filling except the margarine. When it cools, stir in the margarine.
Put cream on the first biscuit, then bananas cut into rings, then a little cream, then put the second biscuit on top, then cream and bananas again.
Garnish with whipped cream as desired. I added a little cocoa to the whipped cream for the edges.