Preheat oven to 375℉
Melt butter and allow to cool.
In the bowl of a stand mixer, add all dry ingredients: flour, baking soda, baking powder, and salt. Lightly whisk together until combined.
Add in wet ingredients: melted (and cooled) butter, water, honey, and sourdough starter.
Using a dough hook, start the mixer on low speed and then increase to medium speed until ingredients are well combined and a ball forms. This usually takes about 3-5 minutes.
Once the dough has formed a ball, place it on a lightly floured surface and begin rolling out into a rectangle. Aim for about a 1/4 inch thick rectangle (does not have to be perfect).
Brush the cinnamon filling evenly onto the rolled-out dough.
Roll the dough up tightly into a log, starting with the long edge. Pinch the edges together once rolled up.
Take your bench scraper or sharp knife and cut the log into equal pieces (don't aim for perfection, just try to get them as close to equal as possible - you should end up with 8 large rolls)
Place them into your pre-buttered skillet, spaced slightly apart.
Bake in pre-heated oven for about 28-35 minutes, until the tops are puffy and browned and the dough is cooked through.
Remove from oven and allow to cool. Pour icing over the top once cooled.
Serve and enjoy!