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COOK pasta as directed on package.
MEANWHILE, cook and stir steak in 2 Tbsp. of the dressing in large skillet on medium-high heat 2 min. or until steak is browned on all sides. Stir in tomatoes with their liquid, the onions, peppers, mushrooms and remaining 2 Tbsp. dressing. Bring to boil. Reduce heat to medium; simmer 10 min. or until onions and peppers are crisp-tender. Remove from heat.
TOP with CHEEZ WHIZ; cover. Let stand 2 to 3 min. or until CHEEZ WHIZ is melted. Serve over hot drained pasta.