01 -
Feed your sourdough starter at least 4 hours in advance to ensure it is active and bubbly.
02 -
Warm the milk and butter in a small pot over medium-low heat until the butter melts. Remove from heat and cool slightly. In a mixing bowl, combine the milk/butter mixture, sugar, sourdough starter, egg, and mashed banana. Mix thoroughly. Add the flour and salt. Using a stand mixer with a dough hook, knead on setting #2 for 5–8 minutes until elastic and smooth.
03 -
Place the dough in a buttered bowl, cover with plastic wrap and a towel, and let sit at room temperature for 8–12 hours or until doubled in size. Alternatively, refrigerate the dough overnight covered with plastic wrap and bring it to room temperature for 1–2 hours before shaping.
04 -
Butter a 9×13 baking dish or a 12-inch round baking dish. Roll the dough out to a 14×12-inch rectangle on a floured surface. Mix the cinnamon sugar filling ingredients and spread evenly over the dough. Roll up tightly from the long side and cut into 9 equal rolls. Place rolls in the prepared pan, leaving space between them. Cover and let rise until doubled in size.
05 -
Preheat oven to 350°F (175°C). For a Cinnabon-style texture, pour 1 cup of heavy cream around the rolls before baking (optional). Bake for 30–35 minutes, or until golden on top. Let cool slightly before frosting.
06 -
Combine all frosting ingredients in a bowl and mix until smooth and creamy. Adjust milk as necessary for your desired frosting consistency. Spread over the cooled rolls and serve.