01 - 
                Stir together the warm milk, sugar, and yeast in a big bowl. Wait around 5 minutes until it gets bubbly.
              
              
              
                02 - 
                Pour in the melted butter, mashed banana, salt, and eggs. Stir everything until it looks smooth.
              
              
              
                03 - 
                Slowly mix in the flour, then knead by hand on a floured countertop for about 10 minutes.
              
              
              
                04 - 
                Grease a bowl, put the dough inside, cover it, and let it sit somewhere warm for an hour, or until it doubles in size.
              
              
              
                05 - 
                Mix together the soft butter, cinnamon, and brown sugar in a smaller bowl.
              
              
              
                06 - 
                Roll the dough out into a big rectangle, about 20x14 inches. Spread the filling across and sprinkle walnuts, if you'd like.
              
              
              
                07 - 
                Roll the dough up tightly starting from the long side. Cut into 12 even pieces and place them in a greased baking pan.
              
              
              
                08 - 
                Let the rolls rise for another 30 minutes while preheating your oven to 350°F (175°C).
              
              
              
                09 - 
                Bake for 25-30 minutes until the tops are golden.
              
              
              
                10 - 
                Whip together the cream cheese, butter, powdered sugar, and vanilla until creamy. Spread over the rolls while they're warm.