Combine first 4 ingredients in small bowl; stir well.
Spread about 1 tablespoon cream cheese mixture over each of 4 bread slices. Top each with 1 ounce ham, 2 tomato slices, and 1 tablespoon cheddar cheese. Place sandwich halves and remaining 4 slices bread on a baking sheet. Broil 2 minutes or until cheese is melted and bread is lightly browned. Top each sandwich half with remaining bread slice. Serve immediately.