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BROWN meat in large nonstick saucepan on medium heat; drain. Add onions and peppers; cook 3 min. or until vegetables are crisp-tender, stirring occasionally.
ADD next 5 ingredients; stir. Cook 5 min. or until heated through, stirring occasionally. Add 3/4 cup cheese; cook and stir 2 to 3 min. or until melted.
SERVE topped with sour cream and remaining cheese.