This spinach salad has such simple ingredients but the flavor is amazing. Without fail, someone asks me for this recipe every single time I make it. You would never guess how easy it is to make. This spinach salad is perfect for entertaining or as a light meal. The mushrooms marinate in the dressing to create wonderful flavor and texture. Most of the ingredients to this salad are in the dressing, which can be easily made ahead of time and keeps for several days, making this salad a real time saver.