Cheesy Delight Hash Brown Casserole

Ingredients

• 1/2 teaspoon coarse ground black pepper
• 1/2 cup unsalted butter, melted
• 1 1/2 teaspoons kosher salt
• 10.5 ounces cream of mushroom soup
• 1/2 yellow onion, minced
• 2 cups shredded cheddar cheese
• 2 cups sour cream
• 32 ounces russet potatoes, peeled and grated