Clean the king oyster mushrooms by wiping them gently with a damp cloth. Trim the tough ends and slice them into thin strips. If you are using larger mushrooms, cut the strips in half.Sliced king oyster mushrooms.
Heat the vegetable oil in a large skillet or wok over medium-high heat. Add the minced garlic and ginger. Stir-fry for about 30 seconds or until fragrant.
Add the sliced king oyster mushrooms to the skillet and stir-fry for approximately 3-4 minutes until they turn golden brown.
In a small bowl, combine Chinese chili bean sauce, soy sauce, oyster sauce, rice vinegar, and sugar. Whisk the ingredients together until well blended.
Pour the sauce mixture over the mushrooms in the skillet. Stir-fry for an additional 2-3 minutes, allowing the flavors to meld together.
Remove the skillet from heat and garnish the dish with freshly chopped scallions.
Serve the Spicy Sautéed King Oyster Mushrooms hot with steamed rice or as a side dish to complement your favorite Asian meal.