Golden Catch: Baked Fish Casserole with Creamed Mushrooms

create a new image about this text Preheat oven to 350°F and cut mushrooms into wedges or cubes. Fry in butter over medium-high heat in a pan or skillet. You just want to soften the mushrooms. Drop heat to low and simmer for 5 to 10 minutes after adding the heavy cream and mustard.   Grease a baking sheet or pan and add the fish. Season fish in salt and pepper and sprinkle 3/4 of the cheese on top. Pour the creamed mushroom mix over the cheese, then add the remaining cheese.   Bake for 30 to 35 minutes if the fish is frozen, less if it isn't. After 20 minutes, check the fish with a fork. When it comes away flaky, it's done.   While the fish is cooking, cut broccoli into florets. Boil in salted water for 5 to 10 minutes or until soft. Remove, strain, add oil or butter and mash with a fork. Season with salt and pepper and serve as a side dish with the casserole.