01 -
Preheat oven to 350°F. In a large bowl, whisk together cream of mushroom soup, milk, garlic salt, and black pepper. Stir in frozen O'Brien potatoes, drained green beans, 1 1/3 cups crispy fried onions, and 1 cup shredded cheese until evenly combined.
02 -
Pour the mixture into a 9x13 inch baking dish. Bake uncovered for 30 minutes or until heated through and bubbly.
03 -
Sprinkle the casserole evenly with remaining 1 cup shredded cheese and 1 1/3 cups crispy fried onions.
04 -
Bake for an additional 5 minutes or until the cheese is melted and the onions are golden brown.
05 -
Remove from oven and serve warm.