Soak noodles in water for 5 minutes or until tender; strain. Pour noodles into a pot with boiling water. Lower heat and simmer 5 minutes. Strain and let col.
Combine greens with mint, and cilantro and gently toss with half the dressing. Put rice noodles on top of salad. Combine cucumber with tomatoes, peas, and the rest of the dressing and arrange over salad.
Heat water, lime juice, and cornstarch to boiling. Whisk in the rest of the ingredients; whisking continually, cook 1 minute or until thick.