Combine all ingredients and mix well. Pour into casserole dish and bake 45 – 55 minutes, until set but not too firm and dry. (It depends on the shape/size of your casserole dish. A deeper dish takes longer.)
I've only ever used Jiffy Corn Muffin Mix so if you use another brand, I would use the same amount.
Casserole dish shape and size will affect cooking time, start checking at 45 minutes, it should be firm to the touch and set, not too jiggly.
Leftovers are delicious and reheat well in the microwave, just cover lightly with a damp paper towel and microwave on high until hot.