Savory Greek Yogurt Parfait

Combine yogurt and oregano in a small bowl. Spoon 1/3 of yogurt mixture into a tall glass; top with cucumber. Spoon a second layer of yogurt mixture over cucumber layer; top with tomato. Stir together remaining 1/3 of yogurt with feta cheese; spoon over tomato. (INGREDIENT ADDITION OPTION: Add 2 sliced radishes and/or a chopped scallion for a zesty bite. Garnish with a dill sprig if desired.)