Preheat oven to 350
In medium saucepan, heat water and margarine until margarine melts
Remove from heat
Stir in seasoned stuffing and 1/2 can onion pieces.
Spoon stuffing mixture into a 9-inch round or fluted baking dish
Press stuffing evening across bottom and up side of dish to form a shell
In medium bowl combine soup, milk, peas, and turkey
Pour into stuffing shell
Bake, covered, at 350 for 30 minutes or until heated through
Remove cover
Top with remaining onions
Bake, uncovered, 5 minutes or until onions are golden brown

(If stuffing mixture is dry, stir in 1 tablespoon water at a time until moist but not wet)