Ingredients

• 1 1/2 pounds fresh green beans, trimmed and snapped
• 2 tablespoons butter, melted
• 2 tablespoons all-purpose flour
• 2 tablespoons grated onion
• 1 teaspoon white sugar
• 1 teaspoon salt
• 2 cups sour cream
• 8 ounces coarsely shredded Swiss cheese
• 2 cups corn flakes, crushed
• 2 tablespoons butter, melted

Instructions

1. Preheat oven to 400 degrees F (200 degrees C).
2. Place a steamer insert into a saucepan and fill with water to just below the bottom of the steamer. Bring water to a boil. Add green beans, cover, and steam until slightly tender, about 5 minutes.
3. Stir 2 tablespoons butter, flour, onion, sugar, and salt together in a saucepan over medium heat; gradually stir in sour cream. Cook and stir mixture until hot, thickened, and smooth, about 10 minutes. Add steamed green beans to the cream mixture. Pour green bean-cream mixture into a 2-quart casserole dish; sprinkle with Swiss cheese.
4. Mix corn flakes and 2 tablespoons butter in a bowl until well coated; sprinkle over Swiss cheese layer.
5. Bake in the preheated oven until cheese is bubbling and topping is browned, about 20 minutes.