Easy banana cake

Ingredients

• 125g butter
• 1 dash vanilla essence
• ¾ cup castor sugar
• 2 eggs
• 3 ripe bananas use 4 if you like it really banana-y
• 200g light sour cream
• 2 cups self raising flour
• 0.5 bicarbonate soda
• 1 tsp allspice
• 1 tsp nutmeg