Beth's Hash-Brown Potato Casserole

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1 stick butter, melted, plus more for greasing

2 pounds large red potatoes, peeled 

2 cups sour cream 

10 ounces Cheddar, shredded 

One 10-ounce can cream of mushroom soup 

1 small onion, finely chopped 

1 teaspoon salt 

1/2 teaspoon pepper 

2 cups crushed butter crackers, such as Ritz