In a large bowl, whisk all marinade ingredients together. Add the chicken breasts and marinate at least 30 minutes.
Preheat oven to 400 degrees and bake 25–30 minutes until golden and cooked through.
Whisk peanut butter, soy sauce, honey, sesame oil, and water or coconut milk. Heat gently until smooth. Adjust consistency as needed, and add spice with chili flakes or Sriracha if desired.
Pour sauce over cooked chicken and toss to coat evenly.
Sprinkle with chopped peanuts, green onions, and cilantro. Serve over rice or noodles.
