In a large bowl, weigh bread flour, sugar, salt, and yeast. Whisk to combine. Using a stand mixer with the beater blade or a handheld mixer, turn on low and slowly pour in milk and butter. Increase speed to medium and beat for 5 minutes.
Cover the bowl with plastic wrap and place in a warm, draft-free area until doubled in volume, about 2 hours. Refrigerate for at least 4 hours or up to 7 days.
Spray insides of muffin rings(if using) with nonstick spray. Heat an electric skillet (or a skillet with a lid) to medium low (about 200-250) and add 1 tbsp butter. Place muffin rings on top of melted butter and sprinkle each with cornmeal. Spoon dough into muffin rings (don't fill completely to the top as the muffins will expand to fill the rings). Sprinkle more cornmeal on top of dough in each ring. Cover the skillet and cook for about 7-8 minutes. When bottoms are browned, divide 1 tablespoon of butter over tops of muffins, if desired, and carefully flip over and, using tongs. Place lid back on skillet and continue to cook for another 7-8 minutes.
Remove the lid and, using tongs, carefully remove the rings from each muffin. They should slide out easily if you greased the rings. Replace the lid and continue to cook for another 1-2 minutes, just to get the sides fully "baked."
Remove the muffins from the skillet and allow to cool fully before fork splitting and toasting.
If you're not opting to use muffin rings, simply sprinkle cornmeal into melted butter and spoon dough in small rounds in skillet. They won't be as uniform and pretty, but they'll still taste great!***DISCLAIMER: The reason I created my own flour blends is because I could not obtain the results I wanted with flour blends that were available in stores, online, or from other gluten free bloggers. My recipes have been developed to be used with my own bread flour blend that I created after painstakingly testing for, in some cases, YEARS to develop what I believe to be a superior gluten free bread like no other. If you do not use my gluten free bread flour blend for this recipe, I cannot speak for the results you will obtain. While store bought blends may give you a satisfactory result, they may NOT give you the results intended in my recipe.