In a large skillet heat oil over medium-high. Add chicken and salt and cook. Stir until cooked through, about 5 minutes.
In a medium saucepan over medium-low whisk together peanut butter, soy sauce, lime juice, ginger, garlic, red pepper flakes, and ½ of cup water. Keep warm, whisking occasionally.
Serve chicken with 2 stacked tortillas per taco. Top with cabbage, pepper, carrot, cilantro, and green onion. Drizzle tacos with peanut sauce.