Bring a large pot of water to a boil. Add the noodles and cook until tender, about 7 minutes. Drain in a colander and rinse under cold running water. Drain and transfer to a large bowl. Toss with 1 tablespoon of the sesame oil, cover and refrigerate.
In the bowl of a food processor, combine 2 tablespoons of the green onions, the jalapenos, garlic, and ginger, and process on high speed. Add the remaining 2 tablespoons of sesame oil, the peanut butter, soy sauce, chicken stock, cilantro, fish sauce, sherry, lime juice, sugar, and pepper flakes. Toss the sauce to taste with the noodles.
To serve, toss the noodles with the chicken strips, bell pepper, cucumber, peanuts, and remaining 2 tablespoons of green onions, and serve.