Flip your dough onto a lightly floured surface. Punch the dough down once, and then fold it over on itself a few times. The goal is to redistribute some of the gasses that have been produced by the yeast and release some of the bigger pockets. Press dough down flat and cover again for about 10 minutes to allow the gluten to relax.
Meanwhile, melt the ½ cup (115g) butter for inside the buns in a glass measuring cup, and assemble the brown sugar and cinnamon (and optional raisins) on the counter. Once you start, you're going to want to have everything within arms reach.
Pour about half the melted butter inside the deep dish pan. Sprinkle half the brown sugar on top, and give it a quick stir to incorporate. This is not an exact science, so don't stress about precise measurements here.
Taking care to try to keep a rectangular shape, roll out your cinnamon bun dough until it is quite thin, less than 1 cm thick. Try to push the dough out towards the corners from the centre of the dough. Every so often, gently lift your dough and allow it to shrink back, flouring lightly underneath again if needed. Lift your dough one last final time before dressing it up. This allows the gluten to relax and prevents wonky buns. The larger you roll your dough out, the move "revolutions" you will have in your finished buns. This is a key to making amazing cinnamon buns!
Spread the remaining melted butter on the dough right to the edges (a pastry brush or your fingers works great for this). Sprinkle the rest of the brown sugar and the cinnamon on top, and raisins if desired. Grab the long edge closest to you, and roll the dough tightly into a log. Pinch the join shut and roll the log so the join is underneath.
Using a sharp knife or a bench scraper, cut the log into 12 equal pieces. I start in half, and then half again (4 pieces), and then thirds for a total of 12 buns.
Place the buns in your prepared baking dish. If the end are threatening to unravel, place ends up again another bun or the sides of the pan so that as they rise, they stay closed. Cover with cling wrap or a towel.
At this point, you can also refrigerate your prepared buns overnight (up to 12 hours) if you wanted to bake off fresh cinnamon buns in the morning. Allow double the proofing time to allow for the dough to return to room temperature (45 min-1 hr)
Proof until doubled in size, approximately 20-30 minutes. If your kitchen is warm and humid, they can be left on the counter. In colder months, you can turn your oven onto the lowest setting (180°F or a "keep warm" setting) with a dish of water on the bottom rack. Turn the oven off before placing the rolls into the oven to proof. When they are doubled, remove from oven and preheat to 350°F.
Bake cinnamon buns for 20-25 minutes at 350°F. Meanwhile, prepare a place to turn the cinnamons out of their pan onto. I use a clean baking tray lined with parchment. They will be very saucy and sticky.
The cinnamon rolls will be done when they are uniformly golden brown and the sauce is bubbling up. Press lightly on the center of a bun; if they sink down and stay, they need more time. Once they spring back up to a light touch, they are done. Pay close attention to the middle ones, as these take the longest to bake.
Remove from oven, and immediately flip pan upside down onto the prepared tray. The bubbling sugar is VERY hot, so do this cautiously. Use a rubber spatula or spoon to scrape any remaining sauce from the pan onto the cinnamon rolls. Let cool for 10-15 minutes before pulling apart. Once they are cool, ice generously with the cream cheese frosting.