Add 1/4 cup light brown sugar and stir to combine. Add 2 Tbsp. water, stir, and bring to a boil. Add the mashed bananas and cook for 3 mins. Pour into a bowl and set aside.
Without cleaning the pan, add 1 Tbsp. of butter and melt over med/high heat. Add 1/4 cup light brown sugar and stir to combine. Add 2 Tbsp. water, stir, and bring to a boil.