How to Make It
Combine first 3 ingredients in a small bowl; stir well. Combine chives and the next 3 ingredients in a small bowl; stir well. Cut 4 (13 x 13-inch) pieces of parchment paper or aluminum foil; trim each into a heart shape.
Arrange 1 piece of fish on half of each parchment heart. Top fish with 1 tablespoon yogurt mixture, and sprinkle with chive mixture.
Fold over other half of each parchment heart. Starting with the rounded edge, pleat and crimp edges together to make a seal; twist ends tightly to seal. Place on a large baking sheet.
Bake at 425° for 15 minutes or until the parchment is puffed and lightly browned. Place on individual serving plates; cut open. Serve immediately.