Green Bean Casserole

Preheat oven to 375 degrees, and prepare an 8 X 8-inch baking dish by spraying it with cooking spray.
Bring a large pot of salted water to a boil.
Add in the green beans and cook for 5 minutes.
Remove from the boiling water and immediately put them into ice water to stop the cooking.
Drain the green beans and set aside.
In a large skillet melt the butter and add the olive oil over medium heat.
When the skillet is hot add in the mushrooms and onions. Saute for 5 minutes.
Sprinkle the flour, and salt and pepper over the mixture and stir until you can no longer see the flour.
Slowly pour in the chicken broth stirring the entire time until the sauce starts to thicken, about 1 minute.
Lower the heat to medium-low and add in the sherry, Worcestershire sauce, cream and milk.
Cook for about 3 minutes, stirring occasionally.
Stir in the green beans.
Place the green bean mixture into the prepared baking dish. Top with fried onions.
Bake for 18-20 minutes. If the topping starts to get too brown cover loosely with foil for the last 7 minutes or so.