For the crème fraîche, vanilla sugar, 1 tbsp. brown sugar and milk, whisk with the whisk of the mixer for approx. 3 minutes until creamy. Cover and put in a cool place.
For the Butterscotch sauce, heat 320 g brown sugar, syrup, cream, butter and 4 tbsp. water in a wide saucepan while stirring until the sugar has melted. Then simmer for 5-10 minutes until syrupy.
Season with 1 pinch of salt and let it cool down for about 5 minutes.
Coarsely grind the muffins. Peel and slice the bananas. Mix with lemon juice.
Put some cream in a large bowl. Layer some banana slices, some butterscotch sauce and some muffin pieces on top. Drizzle with a little brandy. Continue like this until all ingredients are used up.
Serve sprinkled with peanuts.