Place the chicken thighs in a large ziplock bag. Combine the remaining ingredients in a blender and blend until smooth. Pour the marinade over the chicken and seal the bag, pressing out as much air as possible. Marinate in the fridge for at least 1 hour, up to 48 hours.
Heat a grill or grill pan over medium-high heat. Grill the chicken for 4-5 minutes per side, until cooked through to 165 F internally. Let the chicken rest for 5-10 minutes, then slice.
Whisk together the dressing ingredients until smooth. If you're averse to fish sauce, you can use less. Adjust soy sauce or salt to taste.
Cook the rice vermicelli according to package instructions, drain, and rinse with cold water to keep the noodles from sticking together.
Divide the noodles among bowls, top with chopped veggies, herbs, and sliced chicken. Drizzle with dressing as desired and serve with lime wedges on the side.
