In a bowl, combine the sliced chicken, soy sauce, and cornstarch. Mix well and let it marinate for about 15 minutes.
Heat 1 tablespoon of vegetable oil in a large skillet or wok over medium-high heat. Add the marinated chicken and stir-fry until browned and cooked through, about 5-7 minutes. Remove the chicken from the skillet and set aside.
In the same skillet, add the remaining tablespoon of oil. Add the sliced bell peppers, onion, garlic, and ginger. Stir-fry for about 3-4 minutes until the vegetables are tender-crisp.
In a small bowl, whisk together the peanut butter, coconut milk, honey, rice vinegar, and sriracha until smooth.
Return the cooked chicken to the skillet with the vegetables. Pour the peanut sauce over the chicken and vegetables, stirring to combine. Cook for an additional 2-3 minutes until heated through. Season with salt and pepper to taste.
Serve hot, garnished with chopped green onions and crushed peanuts.