Delicious, soft cinnamon rolls made with you very own sourdough starter.
In the bowl of an electric stand mixer, combine the first 7 ingredients and 1/4 cup of the butter. Mix on low-med speed with the dough hook for 10 minutes. Turn into a greased mixing bowl, cover with plastic, and allow to rise at cool room temperature overnight. (If you don't have a mixer, knead by hand until smooth and elastic, about 10-15 minutes.)
Turn the dough out onto a lightly floured work surface, press into a rectangle shape, and roll out into a 10x15" rectangle (about 1/4" thick). No need to "punch the dough down" - pressing and rolling it into shape will do that for you!)
Spread softened butter (about 1/4 cup, but you may not need that much) over the surface of the dough, leaving a little lip on the side farthest from you without butter (this will be where you seal the dough after rolling it up, and you want that to remain sticky). Make sure to spread butter well to all of the edges except for the far edge, as mentioned before.
Sprinkle brown sugar over the surface of the dough (you may need a little more or less than suggested above). Use your fingertips to spread or "massage" the sugar into the butter, spreading it evenly over the surface and right to the edge of the dough, except on the side farthest from you, as mentioned above.
Generously sprinkle cinnamon (again, using more or less than suggested above depending) over the whole butter/sugar covered area on the dough.
Start with the side closest to you, and roll the dough into a jelly roll shape, pinching the last edge to the roll to seal it. Place the roll seam-side down, and cut it into 12 equal sized pieces (about 1" wide each), and lay into a greased 9x13" baking dish (cut side up). Cover and allow to rise 2-3 hours in a warm place, or until doubled.
Preheat the oven to 350 degrees F. When the oven has come to temperature, bake the rolls for 30-40 minutes or until golden brown. Turn out onto wire rack to cool immediately.
Combine all glaze ingredients in a bowl; stir until smooth and combined. Drizzle or spread over baked cinnamon rolls.