Preheat oven to 350° Fahrenheit.
In a bowl combine the corn muffin mix, cans of corn, sour cream, and egg.
In a mini muffin pan, pour the melted butter into the bottom of each tin, just enough to fill the bottom.
Add the corn casserole mixture. Fill to just below the top.
Bake for 25-30 minutes until the top is starting to brown.
If you like the top of your casserole crisp, turn the broiler on for 2-3 minutes to brown the tops more.
Let the corn casserole bites cool in the pan for about 10 minutes.
Take a butter knife and go around the outside of the muffin tin to loosen each bite.
Let the corn casserole bites cool on a cooling rack or serve hot.