First, allow the shredded hash browns to thaw completely. This is a very important step. Preheat oven to 350℉.
While the hash browns are thawing cook the ground beef in a skillet. Cook all the way through until all the meat is brown. Remove from pan once finished then cook the diced onions in the same pan until they are fragrant and translucent.
On the side, mix a bowl of the cream of chicken and sour cream. Then, shred or cube a block of 8oz sharp cheddar cheese. You can use pre-shredded but grating your own will turn out better.
Before adding the shredded hash browns be sure to drain and squeeze out any excess water.
Now, mix the thawed hash browns, cooked hamburger and onions with then cream of chicken and sour cream mix. I added suggested measurements for the salt and pepper. It's best to salt to taste but if I can save you from putting raw hash browns in your mouth I'll help all I can.
Spread everything out evenly in a 9x13 baking dish. Then, top with the shredded cheese.
Bake in a preheated oven for 45 minutes. Allow to cool a bit before serving.