Working in small batches, not more than six at a time, lay out wanton wrappers. Add 1 tablespoon of filling to each wrapper. Dip your finger in water and wet two sides of the wanton wrapper. Fold the wrapper over the filling to create a triangle and seal the edges completely.
Place the completed wantons on a baking sheet lined with parchment paper.
To cook, heat 1 tablespoon of avocado oil in a large skillet, over medium-high heat until it shimmers. Add eight to twelve wantons to the pan. Cook until golden brown, about two minutes.
Reduce the heat to low. Carefully add 1/3 of a cup of vegetable stock to the pan and immediately cover the pan with a lid.
Cook until the stock has completely evaporated. Remove the potstickers to a plate for serving.