Heat oil in large skillet on medium-high heat. Add beef; cook 4 minutes or until browned on all sides. Remove from skillet.

Stir onion and bell pepper into same skillet; cook and stir 3 minutes or until tender. Stir in beans, tomatoes and Seasoning Mix. Bring to boil, stirring occasionally.

Return beef to skillet. Reduce heat to low; cover and simmer 15 minutes. Add cheese; cook and stir 5 minutes longer or until beef is tender and cheese is melted.