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HEAT oven to 350°F.
PREPARE cake batter as directed on package; pour into 13x9-inch baking dish sprayed with cooking spray. Beat dry pudding mixes, sugar, milk and water with whisk 2 min.; pour over cake batter. Place on rimmed baking sheet.
BAKE 55 min. to 1 hour or until toothpick inserted in center comes out clean. Cool 10 min. Meanwhile, heat broiler.
TOP cake with marshmallows. Broil, 6 inches from heat, 30 sec. to 1 min. or until marshmallows are golden brown. Melt chocolate as directed on package; drizzle over marshmallows. Cool 15 min.