Cook the 10 slices bacon in a skillet, then crumble and set aside.
Add the 64 ounces frozen hash brown cubes into a slow cooker, then sprinkle on the 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon seasoning salt, and 1 teaspoon ground black pepper and stir to coat the potatoes.
Then pour in the 5 cups chicken broth, 2 (10oz.) cans cream of chicken soup, and most of the crumbled bacon. Reserve the rest of the bacon crumbles for topping later.
Stir hash browns, liquids, spices, and bacon together until well combined, then cover and cook on high for 3 hours or on low for 6 hours, stirring occasionally.
After 3 or 6 hours, use a fork to check the potatoes to make sure they are fork tender and cooked through.
Add 3 cups of the 4 cups shredded cheddar cheese, softened and cubed 8 ounces cream cheese, and 1 cup heavy cream to the slow cooker and thoroughly stir together. Cook on high for another 30 to 45 minutes or low for 1 to 1½ hours or until all of the cheeses are melted. Make sure to stir occasionally.
Serve warm with bacon, cheese, chives, crackers and sour cream as optional toppings.