Paula Deen's Mashed Baked Potato Casserole

I saw this on a video for Food Network, and it looked so good. Putting here for safe keeping.

• Ready In: 1 hr 10 mins
• Serves: 8-10

Ingredients

• 4  cups frozen hash browns
• 7 5⁄8 ounces instant mashed potatoes with butter and herbs
• 1⁄2 cup butter, softened
• 4  ounces cream cheese, softened
• 1  cup monterey jack cheese, shredded
• 1⁄2 cup sour cream
• 1⁄2 teaspoon  garlic salt
• 1⁄2 teaspoon salt
• 1⁄2 teaspoon pepper
• 2  cups boiling water
• 2  cups  French fried onion rings

Directions

1. Preheat oven to 350 degrees F.
2. Bring a pot of water to the boil and add the hash browns. Cook for 5 minutes and drain. In a large bowl, mix together the cooked hash browns, mashed potato mix, butter, cream cheese, jack cheese, sour cream, garlic salt, salt and pepper. Stir in the boiling water. Place in a greased 2-quart casserole dish. Bake for 35 to 45 minutes. Sprinkle the onion rings over the casserole and bake for about 5 to 8 minutes longer until onions are golden brown.