Preheat your oven to 350°F. Lightly grease a 2-quart casserole dish and set it aside.
In a medium mixing bowl, blend together the melted butter and eggs until well combined. Add in the corn muffin mix, corn kernels, creamed corn, and sour cream. Stir the mixture until all ingredients are fully incorporated.
Pour the batter into the prepared casserole dish, spreading it evenly.
Bake in the preheated oven for 45-55 minutes, or until the top turns a golden brown and the center is set