Cooked in a round 5.5 L SC.
Line and grease desired cake pan.( I used round)
To make the topping , melt the butter , brown sugar and golden syrup ( or maple syrup ) together.
Spread evenly in the cake pan . Slice the bananas and place layered over the sauce in a circular pattern.
In a large bowl mix together the mashed banana , oil , egg , custard , sugar and syrup. Stir in baking powder , salt and flour and mix until no lumps.
Pour mixture over the caramel , banana topping and spread out evenly.
Raise up on egg rings or foil balls in your SC and cook on high approx 2 hours, tea towel under the lid . Cake is cooked when a skewer comes out clean . The topping will bubble up over the cake and settle again as it cools. Allow to cool in the tin for approx 20 mins and then turn out onto a serving plate. Best served warm with custard , cream or vanilla IceCream.