Preheat oven to 350*F (or 425*F for Gluten-free mix).
Our preference, the more we've made this recipe, is to butter a cast-iron skillet and place the cornbread batter into there, as the cornbread stays super moist in the middle and gets those great crispy edges on the outside! However, if you don't have one, feel free to grease a square 8" x 8" or 9" x 9" metal or glass pan with your preferred butter. For a double recipe, it's a 13" x 9" metal or glass pan.
Place cornbread mix in a bowl and stir in the egg and milk (and butter for the Gluten-free version), adding creamed corn, sugar, and flour next.
Once all the ingredients are combined, ensuring there aren’t any dry bits left in the mix, let the batter rest for 2-3 minutes.
Cook for approx. 30-45 minutes or until a toothpick comes out clean in the middle and the edges and top are golden brown. If it needs more time, return to the oven and check in 3-5 minute increments.
Let cool for about 2-3 minutes before slicing and serving. Great with butter and jam, as a side for chili, and of course, BBQ! This recipe will keep for about a week and a half in a Ziploc bag or airtight container in the fridge.