Banana peel breakfast cake - Master recipes

Ingredients

• 125g salted butter, softened, plus extra for the tin -
• 4 very ripe bananas -
• 200g golden caster sugar -
• 2 eggs, beaten -
• 2 tsp vanilla extract -
• 100ml Greek-style yogurt -
• 300g white spelt flour or plain flour -
• ½ tsp baking powder -
• ½ tsp bicarbonate of soda -
• 75g walnuts, roughly chopped -
• 100g salted butter, softened -
• 3 tbsp runny honey -
• 3 tbsp smooth peanut butter -