In a large bowl, combine warm milk and yeast. Let it sit for about 5 minutes until foamy.
Add sugar, melted butter, eggs, and salt to the yeast mixture and mix well.
Gradually add in flour and mashed banana, mixing until a dough forms.
Knead the dough on a floured surface until smooth, about 5-7 minutes.
Place the dough in a greased bowl, cover, and let rise in a warm place until doubled in size, about 1 hour.
Preheat the oven to 350°F (175°C).
Roll out the dough on a floured surface into a rectangle.
Spread a mixture of cinnamon and sugar on top, roll it up tightly, and slice into rolls.
Place rolls in a greased baking pan and let them rise for another 30 minutes.
Bake for 25-30 minutes until golden brown.
Allow to cool slightly before serving.