Place them on a parchment-lined baking sheet in a single layer and flash freeze them for about an hour. Then store them in a gallon-sized ziptop bag and pull out as many as you need at a time. They'll keep in the freezer for 1-2 months. To reheat, pop them in a toaster for a few minutes, or microwave for about 30 seconds at a time, until they reach the desired temperature.