Cook pasta according to package directions for al dente. Drain, rinse in cool water and drain again. Wash chard and remove tough stems. Do not pat dry. Cut into 3/4" wide ribbons. Spray a nonstick skillet with canola cooking spray. Place over medium high heat, add garlic and cook 2 minutes. Add chard and cook until just wilted, about 3 min. Remove from heat. Add onion, sage and thyme to skillet. Toss. Add cooled orzo, 1/2 of the salmon, 1/2 of the walnuts and toss to mix well.

Place a squash ring on each of 4 plates. Fill center with chard mixture. Place a few strips of the smoked salmon around each squash ring. Top with remaining salmon and sprinkle remaining walnuts over all. Serve with vinaigrette on the side. May be served warm or at room temp.