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3 cups miniature marshmellows
Grease a 9x12 baking pan
Put chopped rhubarb in bottom of pan. Sprinkle sugar and dry jello over the rhubarb evenly, add mini marshmellows.
Mix the cake as directed on package. Pour the batter over the marshmellow layer. Bake at 325 degrees for 55 minutes OR until the cake does not jiggle. Top will be dark brown.