Preheat & Prep. To start, preheat oven temperature to 425 degrees F. Line a 12-cup muffin pan (ideally light metal!) with parchment paper liners.
Combine Dry Ingredients. In a large bowl, combine gluten-free flour, cornmeal, sugar, baking powder, and salt. Whisk to combine well.
Add Wet Ingredients. Then, add in milk, melted butter, and eggs and mix until well blended and no dry spots remain.
Let Batter Rest. For the best rise, let the batter rest 45-60 minutes before baking. (If you don't have time, you can bake the muffins right away, they just won't be as tall.)
Scoop Batter. Use a 1/4 cup scoop to measure the batter into the prepared muffin pan. The muffin cups will be quite full! If you want super-tall muffins, you can divide all the batter between the 12 cups. Or, you can use a heaping 1/4 cup scoop of batter in each and end up with 13-14 muffins total. (You'll need to bake the extra 1-2 muffins in a second batch.)
Bake Muffins. Then, bake muffins at 425 degrees F. for 5 minutes. Then, reduce the temperature to 350 degrees F. and continue baking another 12-14 minutes, or until done. A toothpick inserted in the center should come out clean with just a few moist crumbs, and the muffins will be starting to turn golden brown.
Cool. Allow muffins to cool 2-3 minutes in the muffin pan before transferring to a wire rack.
Serve & Store. Enjoy muffins warm with butter, honey, and more! Store leftover corn muffins in an airtight container at room temperature 1-2 days, or freeze up to 2 months.