Heat a medium saute pan over medium heat.
Gently stir the brown sugar, orange juice, vanilla, cinnamon, and rum together.
Simmer until reduced by a third or when the sauce appears syrupy, 5 to 7 minutes.
Add bananas and stir for a minute until the bananas are well-coated.
Turn off the heat and add the chilled butter, stirring constantly until the butter is completely incorporated in the sauce.
Heat the pancakes and pour hot sauce over them.
Sprinkle with powdered sugar.
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