- 6 tbsp. unsalted butter
- 1 medium onion
- 1 lb. mushrooms, chopped
- 2 tsp. salt
- 1/2 tsp. pepper
- 24 oz. frozen or fresh green beans, ends trimmed, and chopped into 1-inch pieces
- 6 tbsp. flour
- 2 cups milk
- non-stick cooking spray
- 8 oz. fried onions (homemade or store bought)
In a large skillet over medium heat, melt 2 tbsp. butter. Add onion and soften, about 4 minutes. Add mushrooms, and cook until softened and all juices have released from the mushrooms, about 10 minutes. Season with 1 tsp. salt and 1/4 tsp. pepper. Set aside to cool.
Cook green beans according to package directions on the stovetop. I boiled mine in salted water for about 5 minutes.
Melt the remaining 4 tbsp. butter in a medium saucepan over medium-low heat. Add 1/4 cup flour, whisk constantly until mixture begins to turn golden, about 3-4 minutes. Slowly pour in milk, and continue whisking until mixture has thickened, about 12 minutes. Stir in remaining salt and pepper. Remove from heat and let cool to room temperature, stirring occasionally. Pour over beans, add the onions and mushrooms and toss to cobmine.
Spray a 9x13 inch pan with non-stick cooking spray. Spread the green bean mixture in the pan. Top with 8 oz. fried onion pieces.