Place the hash brown patties in an air fryer or toaster oven. Cook about 15-20 minutes until crispy. Meanwhile make the rest of the filling.
Heat the oil in a wok or deep skillet. Add the minced garlic and ginger. Sauté a few seconds until fragrant. Add the carrots and celery. Sauté 1 minute, then add the Impossible or Beyond meat. Stir and let it brown.
Add the water chestnuts, soy sauce, msg, Sichuan peppercorns (hua jiao), fresh chilies, and white pepper. Stir to combine.
Combine the cornstarch with the cold water in a small bowl. Stir well. Add this slurry to the skillet.
Remove the hash browns from the air fryer or toaster oven. Add them to the skillet. Crush them into bits with a wooden spoon and incorporate them into the filling.
Chop or crush the peanuts with a mortar and pestle. Add the peanuts and scallions to the skillet. Stir to combine.
Make dumplings using homemade dumpling dough or store-bought dumpling wrappers. If using store-bought, you will need to wet the edges of the wrapper to make it stick.
Heat a nonstick skillet (that has a tightfitting lid) over medium heat. Add 1-2 teaspoons of oil. When hot, arrange the dumplings in a single layer in the skillet. We like to start arranging them in the middle in a starburst pattern, then work our way out adding more dumplings. This creates a chrysanthemum pattern. Fry until the bottom is golden.
Combine the cornstarch with the cold water. Quickly pour this evenly over the dumplings. Immediately lower the heat to low and cover with a lid. Steam until the liquid has evaporated.
Remove the lid. Place a serving plate upside down over the dumplings. Carefully flip the skillet and plate to transfer the dumplings to the plate, crispy-side up. The cornstarch will create a crunchy lace layer.
Serve with dipping sauces. We like dark Chinese vinegar mixed with chili crisp.