Mix the two milks and the cornmeal together in a medium bowl and set aside for 5 min. Whisk together the flour, baking powder, salt and sugar.
Stir into the milk mixture the egg and 1/4 cup melted butter. Add the liquid to the dry ingredients and stir until just combined, batter will still be lumpy.
Heat the 10" cast iron pan on low and melt the 2 Tbsp. of butter. Pour the cornbread batter in and bake for 20-25 min. until set and golden brown.
Nutrition calculation is an estimation only. If you need nutritional calculations for medical reasons, please use a source that you trust.