Cool the mummy bites fully, then refrigerate them in an airtight container for up to 3 days. Keep the dip separately at 40°F or below. For longer storage, freeze unbaked wrapped bites on a tray for 2 hours. Then seal them tightly for up to 1 month. Reheat baked Halloween Cocktail Party Appetizers at 375°F for 6 to 8 minutes. Stir the cold dip for 15 seconds before serving again. Discard anything with a sour smell, slimy sausage surface or watery yogurt that won't mix back together.