Stir together the top 7 ingredients plus the salt & pepper in a small bowl and set aside.
Heat canola oil in an ovenproof skillet over medium-high heat. Season cod with salt & pepper and cook presentation side down for 4 minutes. Carefully turn the cod fillets over and cook for an additional 1 minute.
Length: 5 minutes
Spoon 1 tablespoon of the butter mixture on top of each fillet then transfer the skillet to the oven. Cook for 2 minutes or until cod is cooked through and opaque in the center.
Length: 2 minutes
Add any remaining butter to pan, and let melt, stirring with the juices in pan. Spoon over fish, sprinkle with prosciutto (if desired) and serve immediately.