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Step 1
Place rhubarb in a greased 13x9-in. baking pan. Sprinkle with the gelatin, sugar and marshmallows. Prepare cake mix according to package directions; pour batter over marshmallows.
Step 2
Bake at 350° until a toothpick inserted in the center comes out clean, 40-45 minutes. Cool for 10 minutes; invert cake onto a serving plate. Serve with whipped topping if desired.