Preheat oven to 350℉. Spray a 12 cup muffin pan with non-stick cooking spray.
In a large bowl, whisk together the cornmeal, flour, baking powder, sugar, and salt. Set aside.
Add the milk mixture and melted butter to the dry ingredients. Stir just until blended. Do not over mix, lumps are OK.
Evenly spoon the batter into the prepared muffin pan, filling each well until almost full.
Bake at 350℉ for 15 to 20 minutes or until the tops are golden. Cool the muffins for 5 minutes in the pan on a wire rack. Remove from the muffin pan and serve warm.