Preheat the oven to 400 degrees. Grease a 9-inch cast-iron skillet with butter. (You can also use a cookie sheet) Grab a bowl and mix together the flour, baking soda, salt, and sugar. Make a well in the center of the mixture. Add the egg, buttermilk, and the melted butter. Stir until mixed thoroughly, the dough will be sticky. Sprinkle flour on the countertop and use the flour on your hands to mold the dough in a round shape. Place the dough in the cast-iron skillet. Use a knife to cut an X on the top of the dough. Sprinkle a little tiny amount of flour on the dough. Bake in the oven for 35-40 minutes or until done. I check for doneness by tapping the bread when golden brown. If it sounds hollow, it's done. Let the bread rest on a cooling rack until slightly cool. Slice and enjoy.