5 C. rhubarb 3/4 C. brown sugar 3 C. mini marshmallows 1 yellow cake mix
Place rhubarb in 9x13-inch pan and spread evenly. Sprinkle brown sugar and mini marshmallows evenly on top. Mix cake mix as directed on package. Pour over top of rhubarb mixture and bake at 350 degrees for 1 hour. Top with cool whip and serve.
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