Southern Cornbread
["1 egg", "1 1/3 c. milk or 1 3/4 c. buttermilk", "1/4 c. oil or melted shortening", "2 c. self-rising cornmeal mix"]
["Heat oven to 450\u00b0. Grease 9-inch cast-iron skillet or 9-inch square pan; place in oven to heat."]
["egg", "milk", "oil", "cornmeal mix"]