Green Bean Casserole - cooking recipe

Ingredients

2 cans French green beans
1/4 c. finely chopped onion
1 tsp. sugar
2 Tbsp. flour
1 can mushrooms
1 tube Ritz crackers
2 c. shredded Cheddar cheese
1 stick margarine
16 oz. sour cream

Preparation

Saute onion in 2 tablespoons butter.
Add flour and sugar; remove from heat.
Add sour cream; mix with beans and mushrooms. Melt remaining butter; mix with crushed Ritz crackers.
Cover casserole with cheese.
Top with cracker mixture.
Bake at 350\u00b0 for 35 minutes.