To keep your blueberry cookies fresh and delicious, it's important to store them properly. Once the cookies have completely cooled, place them in an airtight container. You can layer them with parchment paper to prevent sticking. If you live in a humid area, it’s wise to add a slice of bread inside the container; it helps to maintain moisture and keeps your cookies from drying out. Additionally, blueberry cookies can be stored at room temperature for about 4-5 days, or you can extend their life by freezing them. To freeze, wrap each cookie tightly in plastic wrap or foil and place them in a resealable freezer bag. They can last for up to three months in the freezer. When you’re ready to enjoy them, simply thaw at room temperature or warm them briefly in the oven for a fresh-baked taste.