Build fire and stoke coals until hot. Arrange grate above flames. See photos, above recipe card.
Place the 3 Tbs. butter in a heavy 10-inch skillet; place on the grate to melt and warm the pan.
In a separate bowl, whisk together the sour cream, milk and egg. If baking from scratch, in a separate bowl, combine the cornmeal, gfJules Flour™, baking powder, baking soda, salt and sugar (if using).
Stir the wet mixture into the dry ingredients or gfJules Gluten Free Cornbread Mix using a fork or whisk. Fold in the chopped peppers and corn kernels, if using. Spread into the hot greased skillet -- use pot holders!
Cover with aluminum foil, crimping the edges to seal and poke several small holes in the top to vent steam. Place on the grate above the fire, but not directly on top of flames, if possible. Cook for 20 minutes, turning the pan a few times, and checking to ensure that the bottom is not burning. Bake until set and crispy brown around the edges. If you have a toothpick handy, use that to be sure the middle is done. Remove to cool in the pan; cut into wedges to serve.