In a good-sized sauté or fry pan, combine the butter, brown sugar and cinnamon and heat over low heat until the butter melts and the sugar dissolves.
Carefully add the banana liqueur and stir.
Add the bananas and cook until they start to soften and begin to brown. Be careful not to burn them.
Remove the pan from the flame and add the rum carefully.
Spoon the ice cream into individual bowls, add the bananas, and top with the warm sauce. You’ll want to serve this immediately since it doesn’t take long for the sauce to melt the ice cream.