Prep the sauce: In a small bowl, whisk together vinegar, sherry cooking wine, soy sauce (if using), Swerve brown sugar replacement, and water. Sprinkle in konjac powder, whisking quickly to avoid clumps. Set aside.
Cook aromatics: Heat oil in a large skillet or wok over medium-high heat. Add onion, jalapeño, garlic, and ginger. Stir-fry for 1–2 minutes until fragrant.
Add ham & veggies: Toss in the ham, mushrooms, bell peppers, zucchini, and green beans. Stir-fry 4–5 minutes until tender-crisp. Add peas and corn; stir another 2 minutes.
Season: Sprinkle in chili powder, onion powder, red pepper flakes, no-salt seasoning, salt, and black pepper. Stir to coat evenly.
Deglaze & sauce: Pour in the sauce mixture, scraping up any browned bits. Stir and cook 2–3 minutes until everything is coated and glossy. Adjust with extra water if too thick.
Finish & serve: Taste and adjust seasoning (more vinegar for brightness, more Swerve for sweetness, or more chili flakes for heat). Garnish with sliced green onions. Serve hot over steamed rice, quinoa, cauliflower rice, or konjac noodles.