Sourdough Cinnamon Rolls
1 cup unfed sourdough starter 1 teaspoon baking powder 2 cups buttermilk 2 tablespoons butter, cubed 2 tablespoons ground cinnamon 2 tablespoons white sugar 3 cups all-purpose flour, plus more as needed… 6 tablespoons butter, melted ½ cup brown sugar ½ teaspoon baking soda ¾ teaspoon salt