Lay the salmon filets onto a baking sheet sprayed with cooking spray. Season with salt and pepper, to taste. Sprinkle the panko breadcrumbs evenly over the filets. Bake in the preheated oven for 20 minutes or until the fish is flaky.
While the salmon is baking, prepare the dill mustard sauce. Add the sour cream, chicken broth, mustard and dill to a small pan over medium-low heat. Cook until slightly reduced, stirring constantly. Season with salt and pepper, to taste.
Serve the fish immediately with a drizzle of the dill mustard sauce.