Thinly slice the chicken breast into bite-sized strips.
In a small bowl, whisk together the minced lemongrass, garlic, ginger, coconut aminos, fish sauce, sea salt, and black pepper.
Toss the chicken in the marinade and let it sit for at least 15 minutes.
Bring a pot of water to a boil, cook the rice vermicelli according to package directions, then drain and rinse under cold water to prevent sticking.
Heat the avocado oil in a large skillet over medium-high heat. Add the chicken and sear until golden brown and cooked through, about 5-7 minutes.
Prepare the dressing by whisking together the lime juice and sesame oil.
Julienne the cucumber and shred the carrots into thin matchsticks.
Assemble the bowl by placing the noodles at the bottom, followed by the lemongrass chicken, cucumber, and carrots.
Garnish generously with fresh mint and cilantro, then drizzle the lime dressing over the top before serving.