Make the Potsticker Dipping Sauce and set it aside so flavors can mingle.
Make Hoisin Sauce (for the filling), if needed. Click the links above for the recipes.
Heat the sesame oil in a large skillet over medium heat.
Add the mushrooms and green onions and cook, stirring often, for 2-3 minutes.
Add the garlic and ginger and continue to cook, stirring constantly, for 1 minute. Remove from heat and let it cool completely.
Combine the ground pork, cooled mushroom mixture, soy sauce, hoisin sauce, and black pepper, to taste, in a food processor. Pulse until well combined.
Spread the potsticker wraps out and scoop a small teaspoon full of filling onto the center of each wrap.
Wet the top of each potsticker wrap with a baster brush dipped in water. Fold the potsticker to make a moon shape and pinch shut with 4 to 5 pleats along the side. Side Note: Make sure they are sealed, so the filling doesn't fall out.
Place on a baking sheet linked with parchment paper. Cover the completed potstickers with a towel to prevent them from drying out.
Heat 1 tablespoon of olive oil in a pan. Once hot, add the potstickers and cook until the bottoms are golden brown.
Add 1/4 cup of water and cover with a lid. Steam for 3 minutes; remove from pan to a serving tray. Repeat with the remainder of the potstickers.