Preheat oven to 350°. Place baking rack at middle position.
Heat hominy, onions, chilies and seasoning(s) for 10 minutes in sauce pan on range top burner. Stir in sour cream. Pour into a baking dish and sprinkle cheese over top.
Bake until thoroughly heated, about 20 minutes covered and 10 additional minutes with lid removed.
Notes
Per Aunt Geneva Smith: You can skip the precooking step and just throw everything into a baking dish and place in the oven to bake!