Preheat the oven to 350 degrees F. Spray a 1-quart casserole dish with cooking spray and set aside.
In a large pot of boiling water, add green beans and cook for 3 minutes, until bright green. Drain, then place in an ice bath to cool. Transfer to a large bowl and set aside.
1 pound green beans
Meanwhile, in a saucepan set over medium heat, whisk together the soup, milk, Worcestershire sauce, garlic powder, and pepper. Bring the mixture to a simmer, then whisk in 1 cup of the cheese until completely incorporated. Pour over the green beans and toss to coat, then transfer to a casserole dish.
14.5 ounces condensed Cream of Mushroom soup, 1 cup milk, 1 teaspoon Worcestershire sauce, 1 teaspoon garlic powder, 1 teaspoon black pepper, 2 cups shredded cheddar cheese
Top with remaining cheese, then bake for 20 minutes, until warmed through and bubbling around the edges.
2 cups shredded cheddar cheese
Top the casserole with fried onions and the crisp bacon and bake for an additional 5 minutes.
1 ½ cups french fried onions, 4 slices cooked bacon