HEAT dressing in large nonstick skillet on medium-high heat. Meanwhile, coat steaks with flour; gently shake off excess flour. Add to skillet; cook 2 to 3 min. on each side or until steaks are browned on both sides. Remove from heat.

COMBINE tomatoes, broth and tomato paste in slow cooker. Add steaks and peppers; cover with lid. Cook on HIGH 3 to 4 hours (or on LOW 8 to 10 hours).

SPRINKLE with cheese just before serving.