Make the sauce: In a medium bowl, mix the soy sauce, rice vinegar, maple syrup, toasted sesame oil, and gochujang. Set aside.
Cut the mushrooms: Use the tip of a sharp knife to cut the oyster mushrooms from the firm central stem. Discard the firm stem.
Cook the noodles according to the directions on the packet until al dente.
Cook the mushrooms: Meanwhile, heat the oil over medium-high heat in a large non-stick skillet or wok. Stir-fry the mushrooms for about 7 minutes, or until golden brown. Transfer to a plate.
Cook the vegetables: Add the carrots, and green onions to the skillet and stir-fry for about 1 minute, or until the carrots are just tender. Add the bok choy and cook for about one more minute, or until the leaves are just wilted.
Combine the ingredients: Add the cooked noodles, and sauce to the skillet and mix to combine. Fold in the mushrooms and heat until warmed through. Garnish with toasted sesame seeds.
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Notes
Noodles: I used Guanmiao noodles (made from wheat flour) to make this recipe, but most types of noodles will work, including rice noodles.
Mushrooms: Oyster mushrooms can be substituted for ½-pound sliced shiitake mushrooms.
Storage: Refrigerate leftover Oyster Mushroom Noodle Stir-Fry in an airtight container for up to 3 days. Reheat on the stovetop or microwave.