Heat oven to 325°. Line a small baking sheet with nonstick aluminum foil. Place salmon on prepared sheet.
In a small bowl, stir together brown sugar, butter, mustard, salt and pepper. Carefully spread over salmon pieces, dividing equally.
Transfer salmon to 325° oven and bake for 25 minutes, or until fish flakes easily with a fork. Serve with snow peas and rice on the side.