To store puff pastry and Nutella, keep them at room temperature in an airtight container or tightly wrapped in plastic wrap if they will be consumed within a day or two. If you need to store them longer or live in a warm climate, refrigerate them in an airtight container or wrap them. For longer-term storage, individually wrap the pastries and freeze them for up to 2-3 months. When ready to enjoy, thaw at room temperature or reheat in a preheated oven at a low temperature. Remember, freshly baked Nutella puff pastries are best, so aim to consume them promptly for optimal taste.