Soft, fluffy cinnamon rolls with a sourdough twist. Rich cream cheese frosting takes these over the top.

In a large bowl, whisk together the starter, warm milk, sugar, egg, and melted butter.
Add the flour and salt. Mix until a soft dough forms. Knead for 8-10 minutes until smooth and slightly tacky.
Place in a greased bowl, cover, and let rise at room temperature for 3-4 hours until doubled, then refrigerate overnight.
The next morning, remove dough from fridge. On a floured surface, roll into a 16x12 inch rectangle.
Spread the softened butter evenly over the dough, leaving a 1/2-inch border on one long edge.
Mix together the brown sugar, cinnamon, nutmeg, and salt. Sprinkle evenly over the butter.
Starting from the long side with filling, roll the dough into a tight log. Pinch the seam to seal.
Using a sharp knife or unflavored dental floss, cut into 12 equal rolls.
Place rolls cut-side up in a greased 9x13 inch pan. Cover and let rise for 1.5-2 hours until puffy.
Preheat oven to 375°F (190°C). Bake for 28-32 minutes until golden brown.
While rolls bake, make the frosting: beat cream cheese and butter until fluffy, then add powdered sugar, vanilla, and salt. Beat until smooth.
Let rolls cool for 10 minutes, then spread frosting generously over the warm rolls.