Banana and vanilla layer cake

Ingredients

• 125 g butter, softened
• 175 g raw sugar
• 1 tbsp vanilla bean paste or extract
• 1 tsp ground cinnamon
• ¼ tsp ground nutmeg
• Zest 1 lemon
• 2 eggs
• 4 large overripe bananas, roughly mashed
• 315 g self-raising flour
• ½ tsp bi carb soda
• ½ tsp salt flakes
• 200 g Greek yoghurt
• 500 g cream cheese
• 100 g unsalted butter, softened
• 125 g pure icing sugar, sifted
• 1 tbsp vanilla paste
• 1/8 tsp salt flakes