To prepare the walnut mixture, mix together the sugar, cinnamon and walnuts. Set it aside. Beat the butter and sugar into cream; beat until light and fluffy. Add the eggs, one at a time, beating well after each.
Add the cream, bananas, vanilla and mix. Add the powdery mixture and knead well. Pour 1/3 of the mixture into the prepared form. Sprinkle it with 3/4 cup of the walnut mixture. Add the remaining batter over the walnut mixture and sprinkle the top with the rest of it. Bake for 1 hour.
Cool the cake for 10 min, then remove it from the cake form and continue to cool it. To make the glaze, combine the powdered sugar, vanilla and milk until you get a smooth mixture.
If necessary, add more milk. Optionally, garnish with liquid chocolate or nuts.