Banana Raisin Walnut Muffins

• 1 egg
• 1 banana
• 1 muffin
• 1/4 less
• 1,500 gr muffin with nonstick spray
• 120 gr nonfat dry milk powder
• 85 gr golden raisins
• 55 gr brown sugar
• 28 gr sweet whipped butter
• 14 gr walnuts