Prepare the rice vermicelli by soaking in hot water or boiling according to package directions until tender, then rinse under cold water to stop the cooking.
In a small bowl, whisk together the lime juice, coconut aminos, and fish sauce to create a bright and tangy dressing.
Season the sliced chicken breast with minced lemongrass, minced garlic, sea salt, and black pepper.
Heat the olive oil in a skillet over medium-high heat and sauté the chicken until it is golden brown and cooked through.
Arrange the shredded romaine lettuce in a large bowl, followed by the cooked vermicelli, shredded carrots, and sliced cucumber.
Place the warm lemongrass chicken on top and garnish with fresh cilantro, mint, and crushed peanuts before drizzling with the prepared dressing.