Prepare Dough: Combine yeast, warm milk, and sugar. Let sit until foamy. Add mashed bananas, butter, egg, flour, and salt. Knead until smooth.
First Rise: Cover and let dough rise for 1 hour until doubled.
Roll Out Dough: Roll into a rectangle on a floured surface.
Spread Filling: Mix butter, brown sugar, and cinnamon. Spread evenly over dough.
Shape Rolls: Roll dough into a log, slice into 12 spirals, and place in greased baking dish.
Second Rise: Cover and let rise for 30 minutes until puffy.
Bake: Bake at 350°F (175°C) for 25–30 minutes until golden brown.
Make Frosting: Beat cream cheese, butter, powdered sugar, and vanilla until smooth.
Frost Rolls: Let rolls cool slightly, then spread frosting generously.
Expert Tip: Allow rolls to cool for 10 minutes before frosting to prevent melting.