Preheat oven to 350 degrees.
Place fish in a lightly-oiled baking dish and season evenly with salt and pepper; bake for 10 to 12 minutes or until fish flakes easily when tested with a fork.
Meanwhile, in a food processor, combine remaining ingredients (cream cheese through soy sauce); pulse several times, until chunky/smooth.
Transfer mixture to a small saucepan over medium heat.
Bring to a boil and whisk well until smooth; serve immediately over fish.