Step 1: Preheat oven to 375°F.
Step 2: Spray a 9 x 13 baking pan with cooking spray.
Step 3: Place rhubarb in the the pan.
Step 4: Mix the Jell-O and the sugar together and sprinkle evenly over the top of the rhubarb.
Step 5: Top with marshmallows.
Step 6: Mix the cake mix, eggs, oil, water, according to package directions, and pour over marshmallows.
Step 7: Bake for 45 minutes, or until done.
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