In a large bowl, add glass noodles and cover with boiling water. Let soak until softened, about 7 minutes. Drain, rinse with cold water, and drain again. Divide among four bowls. Top each bowl with sliced chicken and cucumbers.
In a small bowl, whisk together peanut butter, brown sugar, soy sauce, vinegar, garlic, chili oil, and sesame oil. Drizzle over the chicken, cucumber, and noodles.
Garnish each bowl with spring onion, shallot, peanuts, and chili.