Bake the salmon according to package instructions, after cooking remove the fish and discard the Bake Perfect Oven Bags and extra juices. Remove the skin from the fish and use a fork to tear the salmon up.
While the salmon is baking, begin making the mashed potatoes.
In a large saucepan, create a roux with butter a flour by stirring it together until thick, slowly add the cream and stir for 1 more minute.
Add the fish, vegetables, salt, and pepper to the roux and toss to coat. Transfer the fish and vegetable mixture to a 9x9-inch baking dish.
Pie or spread the mashed potatoes on top of the fish and veggie mixture and bake for 30 minutes at 350 degrees F. If you like your potatoes a little crispy on the top, broil on love for the last few minutes.
Storebought or instant potatoes may be used in place of homemade.