Preheat oven to 350°.
In a mixing bowl, add in the hominy, chiles, sour cream, cheese, onion, and seasoning.
Stir all ingredients together.
In a greased 8X8 casserole dish, pour in the hominy mixture.
In a separate bowl, mix the ritz and butter together and sprinkle evenly on top of the casserole.
Bake for 30-35 minutes or until the top is golden brown.