Banana muffins

INGREDIENTS

• 75g/3oz melted butter
• 250g/9oz self-raising flour
• 1 tsp baking powder
• ½ tsp bicarbonate of soda
• pinch of salt
• ½ tsp ground cinnamon
• ½ tsp ground nutmeg
• 115g/4oz caster sugar
• 1 tsp vanilla extract
• 2 large, ripe bananas
• 2 medium eggs
• 125ml/4fl oz milk
• 10 walnut
• 2 bananas
• 50g/2oz walnut
• 2 tbsp crème fraïche or yoghurt
• 2 tbsp runny honey