Place the bag of frozen hashbrown potatoes in the refrigerator overnight to thaw. You may also pour the amount of hash brown you need into a bowl or plate and thaw on the counter for about 30-45 minutes. Another option for hash brown thawing is the microwave. Pour the amount you need into a microwave safe bowl then use the thaw setting on microwave or cook at 50% power for 30 second intervals. Stir and continue 30 second cooking intervals until thawed.