I don't prepare many of my own meals, but I do do fish in a bag. I use tilapia put in an aluminum foil with butter, olive oil, salt, and pepper, along with chopped onions and asparagus spears. It bakes in the oven between 15 and 30 minutes depending on the size of the fish.
It's one of my favorite meals.
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"You have a responsibility to consider all sides of a problem and a responsibility to make a judgment and a responsibility to care for all involved." --Ian Danskin