Melt butter in a small saucepan. Add brown sugar and stir to combine. Cook on medium heat for a couple of minutes until sugar is dissolved and mixture begins to look a bit browner. Add vanilla and bananas and stir to coat. Cook just long enough to heat bananas.
Dad would take banana mixture off the heat, cover the pan, and scoop ice cream. This was long enough for bananas to get warm but not too soft.
Serve over vanilla ice cream. Topping with whipped topping and a cherry is optional but pretty.