Prepare rice noodles according to package directions; drain and set aside. Working with one sheet of rice paper at a time, completely immerse a sheet of rice paper in hot water for a few seconds.
Remove from water; lay flat on work surface. On one half of rice paper, place small handful of lettuce and carrots, four slices of chicken, two or three cilantro leaves, two or three mint leaves, a pinch of scallion, four or five sliced mushrooms and a small wad of noodles. Fold bottom half of the rice paper up over the filling; roll up the sides of the paper to close roll into a pocket. Serve on 8 small plates over additional lettuce leaves, with Spicy Tomato Chili Sauce and Peanut-Hoisin Sauce (recipes follow).