Combine the mayonnaise, sour cream,lemon juice, and pressed garlic in a small bowl and set aside.
Season both sides of the salmon fillets with salt and pepper. Then transfer the fish to a rimmed baking sheet lined with foil. Note: if you are using salmon with skin on, just generously season only the side without skin.
Spread the mayonnaise mixture on top of each fillet.
In a separate bowl, use a fork to combine the panko bread crumbs, grated Parmesan cheese, dried dill, and melted butter.
Evenly spread the bread crumb mixture over the mayonnaise on each salmon fillet. Bake at 400 degrees Fahrenheit for 15-20 minutes. Cooking time may vary depending on the thickness of the fillet. Always make sure that your salmon reaches an internal temperature of at leasrt 145 degrees Fahrenhiet.
Notes
Serving a crowd- This can be made with a whole salmon fillet instead of small fillet cuts. The bake time will be longer though.
Make-ahead- the mayonnaise mixture can be slathered on hours before topping with the crust and baking.
Bake time- If the salmon is cold out of the fridge, it may take longer to bake.