Start by finely chopping the mushrooms. A food processor works wonders here! In a medium mixing bowl, combine the mushrooms with shredded cabbage, carrots, green onions, and ginger. Pour in the Mongolian Sauce. Mix until everything is evenly coated in that delectable sauce.
Now comes the fun part – assembling! Lay a wonton wrapper flat on your workspace. Spoon about a tablespoon of filling in the center. Using your finger, moisten the edges of the wrapper with the beaten egg. Fold it in half to form a triangle, sealing it well.
Gently press out any air bubbles and ensure the edges are tightly sealed. Repeat with the remaining wrappers and filling.
Heat a large skillet over medium heat and add a splash of vegetable oil. Once hot, arrange the potstickers in a single layer without overcrowding. Fry them for about 2-3 minutes until they're golden brown on the bottom.
Next, carefully add 1/4 cup of water to the skillet and cover it immediately. This steaming process will cook the tops. Allow them to steam for about 5 minutes or until the water has evaporated.
Once done, remove the lid and let them sit for a minute. Serve your beautiful potstickers with the extra Mongolian Sauce and any other dipping sauces desired. Enjoy each bite!