Hamburger Green Bean Casserole

1 1/2 lbs ground beef

1/2 onion, chopped

1 tsp sea salt

1/8 tsp pepper

1/8 tsp thyme

2-3 cups cooked green beans

1/2 recipe Cream of Mushroom Soup (or 1 can)

1/2 cup sour cream

Optional additions:
cooked rotini noodles - 1 box
sliced mushrooms
top with grated cheddar cheese

Brown ground beef and onions together. Drain and combine with all other ingredients in a 2 quart casserole dish. Bake at 350˚ for 25-30 minutes, or until heated through and bubbly.