Green Bean Casserole - cooking recipe

Ingredients

2 (9 oz) pkg. frozen French-style green bean (partially cooked)
2 Tbsp. butter
1/2 envelope dry onion soup mix
1/2 c. sour cream
1 can cream of mushroom
1 (3 oz) can French fried onion rings

Preparation

Drain beans and stir in butter. Mix other ingredients into the beans and pour all into a casserole dish. Bake uncovered at 350\u00b0 for 20 minutes. Top with onion rings and bake 5 to 10 minutes longer.