Using a large scoop, fill the 12 paper liners equally. It should be close to the top. If desired, sprinkle some turbinado sugar over the batter.
Place pan on rack and set timer for 5 minutes. When the timer goes off, set oven temperature to 350℉. Reset timer for 15 minutes. Do not open the oven.
Remove pan from oven and onto a cooling rack for about 5 minutes. Then remove the muffins and allow them to continue to cool on rack.