Let this peanut butter protein granola cool down completely, before storing it in a airtight container in a cool and dry place for up to a month, depending on the climate. You can also choose to refrigerate it. Any longer than that, you can freeze it instead in sealed containers or zip-top bags for up to 3 months. It can be enjoyed straight out of the freezer without thawing or reheating. Bonus point : It will stay super crispy when stored in the freezer !