Preheat oven to 450°F.
Arrange fish on a parchment paper-lined baking sheet. Sprinkle with salt and pepper. Bake at 450°F for 10 minutes or until desired degree of doneness. Remove pan from oven. Turn on broiler.
Combine panko, parsley, oil, thyme, and Dijon in a small bowl. Spoon panko mixture evenly over fish, pressing to adhere. Place pan in oven; broil 1 to 2 minutes or until topping is browned.
Combine yogurt, dill, milk, and vinegar in a small bowl. Serve with fish.
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