Whisk the sauce: In a small bowl, mix soy sauce, rice vinegar, sesame oil, sriracha, honey, and black pepper. Set aside.
Heat the pan: Place a large skillet or wok over medium-high heat.
Add the neutral oil and let it shimmer.
Brown the turkey: Add ground turkey and break it up with a spatula. Cook until no longer pink and lightly browned, about 5–6 minutes. Sprinkle with a pinch of salt if your soy sauce is very low-sodium.
Add aromatics: Stir in onion, garlic, and ginger.
Cook 2–3 minutes until fragrant and the onion softens. If using mushrooms or bell pepper, add them now and sauté until tender-crisp.
Add the slaw: Toss in the coleslaw mix. Cook, tossing often, until the cabbage wilts but still has a little bite, 3–4 minutes.
Sauce it up: Pour in the sauce and stir to coat everything evenly.
Cook 1–2 more minutes to let flavors meld and any excess moisture reduce slightly.
Optional eggs: Push the mixture to one side of the pan. Add a tiny drizzle of oil to the empty space. Pour in beaten eggs and scramble until set, then fold into the slaw.
Finish: Stir in green onions.
Taste and adjust: add more soy for salt, vinegar for brightness, or sriracha for heat.
Garnish and serve: Top with sesame seeds and herbs if you like. Serve as-is, over cauliflower rice, steamed rice, or in lettuce cups.