Slice chicken into ½ inch chunks. Transfer into a large bowl and toss with soy sauce, salt, garlic powder, white pepper, and black pepper.
Heat light oil in a large skillet pan on medium-high. Add chicken when hot.
Cook chicken until browned on the edges and most liquid has evaporated, about 10-15 minutes.
In a small bowl, add mayonnaise, sweet chili sauce, sriracha, and honey. Stir until combined into a smooth sauce.
Assemble soft tacos with slaw mix (sliced cabbage, carrots, and peppers), chicken, and sauce. Garnish with lime juice and sliced avocado if desired.