INGREDIENTS
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1 small red onion, sliced, separated into rings
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4 tsp. KRAFT Balsamic Vinaigrette Dressing, divided
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6 fresh mushrooms, sliced
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4 slices multi-grain bread, toasted
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1 Tbsp. KRAFT Mayo Homestyle Real Mayonnaise
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1 tsp. GREY POUPON Dijon Mustard
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1/2 cup loosely packed baby spinach leaves
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1/4 lb. sliced roast beef
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2 KRAFT Big Slice Colby Jack Cheese Slices