Heat the sesame oil in a large pan over medium-low heat. Add in the garlic, stir with a large wooden spoon, and cook for 1 minute or until fragrant and just barely golden. Add in the mushrooms and sea salt, and cook for 12 to 14 minutes or until the mushrooms are tender and golden and most of the liquid has evaporated, stirring occasionally. Add the scallions, stir, and cook for another 2-3 minutes or until tender. Season to taste (I add an additional 1/8 teaspoon sea salt).
Prepare a clean work surface (e.g., cutting board), and have the following within reach: the dumpling wrappers, a small bowl filled with water, and a small pan lined with parchment paper.
One at a time, place the wrappers on the work surface, fill with a 1/2 tablespoon of the filling (resist the urge to overfill), dip your fingers in the water, wet the edge of the wrapper, fold over, and press edges together to seal. Place on the pan, and repeat until filling is gone. To keep them from drying out as you're working, place a damp cloth over the filled dumplings.
There are two options for cooking: pan-fry and then steam (potstickers) or steam (dumplings). To make potstickers: add about 1 tablespoon of refined coconut oil to a large skillet (enough to coat the bottom of the pan) over medium-high heat. Add the dumplings in a single layer, being careful not to crowd the pan. Cook for 2 to 3 minutes or until the bottoms have developed a golden-brown crust. Then, pour 1/4 cup water into the pan, immediately cover the pan with a tight-fitting lid, and steam for 4 to 5 minutes. You'll know they're ready when the water has absorbed, and the wrappers become translucent. Use tongs to carefully remove the potstickers from the pan and place on a plate or platter. Repeat until all potstickers are cooked, and serve alongside the chili-garlic sauce. To make dumplings: add the dumplings to a steamer or steamer basket, and steam for 8 to 10 minutes or until the wrappers become translucent. Carefully remove the dumplings from the steamer and place on a plate or platter. Repeat until all dumplings are cooked, and serve alongside the chili-garlic sauce.