01 - Cook rice vermicelli noodles according to package directions until tender. Drain thoroughly and rinse under cold running water to stop cooking and prevent sticking. Set aside in a colander to drain completely.
02 - Julienne the carrot and cucumber into thin matchsticks. Slice the red bell pepper into thin strips. Arrange cooked chicken, prepared vegetables, lettuce leaves, and fresh herbs in separate piles near your work station for easy assembly.
03 - Fill a large shallow bowl or pie dish with warm water. Submerge one rice paper wrapper completely for 5-10 seconds until pliable and slightly translucent. Remove from water and place flat on a clean, damp kitchen towel or cutting board.
04 - Position the wrapper so one edge faces you. Layer ingredients on the bottom third: place one lettuce leaf first, followed by a small handful of noodles, sliced chicken, carrot strips, cucumber strips, bell pepper, and 2-3 leaves each of mint, cilantro, and Thai basil.
05 - Fold both sides of the wrapper inward toward the center. Starting from the bottom edge, roll up tightly away from you, tucking in the fillings firmly as you roll. The wrapper will seal itself. Repeat with remaining ingredients. Keep finished rolls covered with a damp towel.
06 - In a small bowl, whisk together hoisin sauce, peanut butter, soy sauce, rice vinegar, and sugar until completely smooth and emulsified. Add warm water 1 tablespoon at a time until desired consistency is reached. Stir in sriracha if adding heat. Top with crushed peanuts.
07 - Serve rolls whole or cut diagonally in half with a sharp knife. Arrange on a platter with the peanut dipping sauce on the side. Best served immediately while wrappers are fresh and vegetables are crisp.