In a large skillet, brown the ground beef with the minced onion and garlic powder. Drain and return to the skillet.
Stir in the cream of mushroom soup and milk, and combine together with the meat. Then stir in the frozen hash browns and stir into the sauce. Cover with tight fitting lid and simmer for 10 to 15 minutes, or until hash browns have softened and sauce has thickened. Season with salt and pepper to taste.
Top with shredded sharp cheddar cheese and let melt. If needed, run the skillet under the broiler to melt the cheese. (Make sure its an ovenproof skillet!) Garnish with sliced green onions.
Prepare the salad.
Serve Cheeseburger Hashbrown Skillet with side salad.