COOK CHICKEN: Clean and oil gas grill with oil spray or paper towel dipped in oil. Heat grill to medium-high heat, about 425F/218C. Combine chicken seasoning ingredients in a bowl. Add chicken thighs, trimmed of fat, and stir to coat evenly. Spray chicken with oil lightly (to prevent sticking). Place chicken on grates and cook for 2-4 minutes per side or until cooked through. Rest chicken for 5 minutes and cut into small pieces. Note 5 to pan-sear chicken instead.
2 tablespoons mayonnaise, 2 teaspoons Dijon mustard, 2 teaspoons soy sauce, 2 teaspoons lemon juice, 1/2 teaspoon garlic powder, 1 pound skinless boneless chicken thighs, Note 1
BOIL NOODLES: While grill is heating and chicken is cooking, boil the noodles according to package directions (2-8 minutes depending on type of noodle). Drain and set aside.
SAUTÉ VEGETABLES: At the same time, heat a large skillet to medium high heat with 2 teaspoons oil. Sauté vegetables, including spinach if using, for 3-4 minutes until tender crisp. Lightly sprinkle with salt if you like.
MAKE SAUCE: Stir together coconut sauce ingredients in a small bowl or measuring cup.
160 ml mini can of full-fat coconut milk, unsweetened, 2 tablespoons chili crisp, 2 teaspoons lemon juice, 1 teaspoon maple syrup, 1/2 teaspoon kosher salt, optional: 1 teaspoon fish sauce
FINISH THE DISH: If noodles are cold, run them under hot water before adding them to skillet with vegetables. Add sauce and chicken pieces and half the cilantro (if using). Stir to combine. Taste and add more salt and a squeeze of lime if you like. Transfer to platter and add remaining herbs and optional garnish e.g. chili crisp and bean sprouts if using. If making the dish ahead and warming it up, add a few tablespoons water to loosen up the sauce.