INGREDIENTS
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1 lb. lean ground beef
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1/4 lb. mixed fresh mushrooms (button and cremini), sliced
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1/2 cup sliced red onions
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1 Tbsp. olive oil
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4 KRAFT Big Slice Swiss Cheese Slices
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4 onion sandwich rolls, split
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1/4 cup KRAFT Real Mayo Mayonnaise
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1 Tbsp. KRAFT Prepared Horseradish
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1 Tbsp. chopped fresh chives