Heat sesame oil in a large skillet over medium heat. Add minced garlic and sauté for about 1 minute until fragrant.
Add chopped mushrooms, shredded cabbage, and grated carrots to the skillet. Sauté for 5-7 minutes, stirring occasionally, until the vegetables are tender. Remove from heat and let it cool slightly.
In a small bowl combine the soy sauce, sriracha sauce, peanut butter and water. Stir until everything is well combined.
In a large mixing bowl, combine the sautéed vegetables with the sliced green onions. Pour the sauce over the top and toss until the veggies are well coated in the sauce.
Take a potsticker wrapper and place about 1 heaping teaspoon of filling in the center. Dip your finger in water and run it along the edges of the wrapper. Fold the wrapper over the filling to create a half-moon shape and press the edges firmly to seal. If you want to make a pleat fold as I have, see the instructions in my blog post above.
Heat 1 tablespoon of vegetable oil in a large non-stick skillet over medium heat. Once hot, arrange the potstickers in a single layer in the skillet, making sure they're not touching each other. Cook for 2-3 minutes until the bottoms are golden brown.
Carefully pour ¼ cup of water into the skillet and immediately cover with a lid. Allow the potstickers to steam for 5-6 minutes or until the water has evaporated.
Remove the lid and continue cooking for another 1-2 minutes until the bottoms are crisp again and the potstickers are fully cooked through.
Transfer the potstickers to a serving plate and repeat the cooking process with the remaining potstickers, adding more oil to the skillet as needed.