Method
Preheat oven to 190ºC, gas mark 5.
Sieve the flour, baking powder, baking soda and salt into a bowl. Melt the butter.
Crack the eggs into a bowl and lightly beat. Then add the sugar and melted butter.
Mash the bananas and add to the flour. Mix in lightly to the sugar, butter and egg mixture.
Put the mixture into muffin cases and bake for approximately 20 minutes.
To prepare the toffee sauce, place the soft brown sugar, butter and cream into a saucepan. Melt over a low heat until it boils. Simmer until it goes golden brown and thickens slightly.
Cut each muffin into three layers. Place the sliced banana and toffee sauce between each layer, and pour toffee sauce over the muffin.
Dust with icing sugar and serve.