Sift 350 gr of flour with 1 1/2 teaspoon of baking powder. Add 100g of sugar and 1/4 tbsp of salt. Melt 115 g butter and beat with 2 eggs and 300ml of milk. To connect with 2 mashed into a puree bananas, 80 gr melted white chocolate and 40 grams of walnuts. To shift into molds for muffins and bake at 200 deg. for 20 min.