Yep! Place fully cooled green beans on a sheet pan in a single layer and freeze for 30 minutes. Remove them from the freezer and transfer to a freezer-safe, airtight container, and freeze for up to three months. When you're ready to eat them, put them straight in the air fryer from frozen for about 12-15 minutes. Note, the texture of cooked frozen vegetables is always a little different than fresh because the water in the veggies has been frozen and then thawed.