Place Each Ham Slice In A Greased 10-Oz. Ramekin Or Custard Cup. Sprinkle With Onions And 1 Cup Cheese. In A Bowl, Beat Eggs And Yogurt Until Blended; Pour Into Cups. Sprinkle With Parsley And The Remaining Cheese. Bake, Uncovered, At 350 Degrees F For 25-30 Minutes Or Until A Knife Inserted Near The Center Comes Out Clean. Serve Immediately.