Heat oil in skillet on medium high. Add mushrooms and onions cook until onions are translucent. Set aside. In same pan, sear and cook salmon for 3 minutes each side. Add ½ cup Marie’s Spinach Salad Dressing in final 2 minutes. In large bowl, pour ½ cup Marie’s Spinach Salad Dressing over baby spinach and gently toss. Add sun-dried tomatoes, mushrooms and onions and toss. Divide salad onto 4 plates and top with salmon filets.