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