Mashed Potato Casserole

"Mashed Potato Casserole - great make ahead side dish for the holidays! SO easy and tastes AMAZING!!! Instant mashed potatoes, hash browns, cream cheese, butter, Monterey Jack cheese, sour cream, garlic, salt, pepper, and french fried onions. Can make in advance and refrigerate or freeze for later. Great for a crowd! #thanksgiving #casserole #makeahead #freezermeal #christmas..."

INGREDIENTS
2 (4-oz) packages butter & herb instant mashed potatoes
1 (32-oz) package frozen shredded hash brown potatoes
1/2 cup butter, softened
4-oz cream cheese, softened
1 cup shredded Monterey Jack cheese
1/2 cup sour cream
1/2 tsp garlic powder
1/2 tsp salt, or to taste
1/2 tsp pepper, or to taste
1 (2.8-oz) can French fried onions
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