For an extra layer of flavor, consider adding a small amount of grated ginger or minced garlic to the filling mixture. If you don't have peanut oil, vegetable oil or canola oil can be used as a substitute. To prevent the potstickers from sticking to the skillet, ensure it's well-seasoned or use a non-stick pan. These potstickers can be made ahead of time and frozen. To freeze, place the assembled potstickers on a baking sheet lined with parchment paper and freeze until solid. Then, transfer them to a freezer-safe bag or container. Cook from frozen, adding a few extra minutes to the cooking time.