In a small bowl, mix 1% milk with 1 tablespoon white vinegar and set aside for 10 minutes. Alternatively, buttermilk can be set aside in the small bowl.
Mix egg into the milk/ buttermilk mixture.
In a medium bowl, whisk flour, cornmeal, corn, sugar, baking powder and baking soda.
Pour egg and milk mixture into the dry ingredients.
Pour melted butter into the bowl of cornbread ingredients.
Stir cornbread mixture until just combined.
Drop spoonfuls of cornbread batter onto the tamale filling and spread into an even layer across the skillet.
Place skillet into hot oven for 15 minutes or longer until a toothpick comes out clean from the middle.
Using potholders to remove the full skillet from the oven.
Brush melted butter onto the cornbread crust. Serve.