Preheat Oven to 350 degrees Fahrenheit
To a pot, add cold water and bring to a boil. Blanch green beans until tender, about 3 minutes. Strain, and set aside.
In a saucepan, sauté bacon until crispy. Add onions and sauté for 5-7 minutes. Pour in cream of mushroom, milk, and stir. Add cheddar 1/3 cup of cheddar cheese, mix again.
Transfer mixture to a casserole dish and spread evenly over the bottom of the pan. Sprinkle with French-Onions over the top then sprinkle with the remaining cheese.
Bake in the oven for 25-30 minutes.
In a skillet with 1 inch of oil heat oil over medium heat.
Next, thinly slice onions. Transfer onions to a bowl, and pour in 1/2 cup of milk. Transfer onions to a bowl with flour, season with 1 teaspoon of salt and pepper.
Fry onions until golden brown and crispy.
Remove casserole from the oven and top with crispy fried onions, enjoy!
