1. In medium skillet cook ground beef and garlic until meat is browned. Drain off fat. Stir in spaghetti sauce, oregano and pepper. Bring to boil. Reduce heat. Simmer, uncovered, about 3 minutes or until mixture is thick.
2. On baking sheet arrange crackers. Top each with some beef mixture and cheese piece. Bake at 450°F for 2 to 3 minutes or until cheese melts.