Breakfast Casseroles - The Kitchen Magpie

Ingredients

• 1 2 lb bag of frozen hash brown potatoes, thawed
• 1/2 cup butter (softened)
• 1 teaspoon salt
• 1/2 teaspoon ground black pepper
• 1/2 cup finely chopped white onion
• 1 10.75 ounce can condensed cream of mushroom soup ((or cream of chicken))
• 2 cups shredded Cheddar cheese