Preheat oven to 350°F.
In a large microwave-safe bowl, add the drained green beans, cream of mushroom soup, and 1/2 can of cheddar cheese soup. Mix until everything is well combined.
Microwave for 3 minutes, then carefully stir.
Add a pinch of salt, if using, plenty of black pepper, and 1/2 cup shredded cheddar cheese. Mix again until combined.
Microwave for another 3 minutes.
Lightly spray an oven-safe baking dish with nonstick cooking spray. Pour the green bean mixture into the dish and spread it out evenly.
Top with fried onions and sprinkle the remaining shredded cheddar cheese over the top.
Bake for about 10 minutes, or until the cheese is melted and the casserole is warm and bubbly.
Serve warm and enjoy.