01 -
Set your oven to 350°F and grease a 9x13-inch dish lightly with cooking spray.
02 -
In a big bowl, throw in the thawed hash browns, diced onion, Sharp cheddar, cream of mushroom soup, melted butter, sour cream, all seasonings, and a little salt and pepper.
03 -
Stir everything together until it looks nice and evenly mixed.
04 -
Scoop the mixture into the greased dish and flatten it to even it out.
05 -
Scatter the shredded Colby cheese over the top of the casserole evenly.
06 -
Pop it in the oven, uncovered, and bake for 45 minutes. The top should look golden and crispy, and it should be bubbling around the edges.
07 -
Take it out of the oven, let it cool briefly, and then dish it up.