01 -
Preheat oven to 350 degrees Fahrenheit. In a large mixing bowl, whisk together cream of mushroom soup, whole 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 -
Transfer the mixture into a 9x13-inch baking dish, spreading evenly. Bake uncovered for 30 minutes or until the casserole is hot and bubbling.
03 -
Remove casserole from oven and sprinkle the remaining 1 cup shredded cheese and 1 1/3 cups crispy fried onions evenly over the top. Return to oven and bake for an additional 5 minutes until cheese melts and onions turn light golden brown.
04 -
Remove from oven and let stand briefly before serving warm to enjoy this enhanced classic side dish.