Product Recall: One SKU of Oscar Mayer Classic Wieners due to possible mislabeling. Click Here.
TOSS spinach leaves with mushrooms and onions in large salad bowl; set aside.
MIX dressing and walnuts in microwavable measuring cup. Microwave on HIGH 30 seconds or until warmed; stir.
POUR over spinach mixture; toss to coat. Serve immediately.