Preheat oven to 350ºF (175ºC).
In a large bowl, combine green beans, cream of mushroom soup, 1 cup shredded cheddar cheese, minced garlic, and onion powder. Mix well.
Pour the mixture into a 9x13-inch casserole dish and spread evenly.
Top with the remaining shredded cheddar cheese.
Bake uncovered for 30 minutes, or until the casserole is hot and bubbly.
Remove from oven, sprinkle French Fried onions on top, and return to the oven for another 5–10 minutes, until the topping is golden brown.
Serve hot and enjoy!