5 c. cut up rhubarb
1 sm. pkg. red Jello
1 c. sugar
3 c. mini marshmallows
1 yellow cake mix

Spread rhubarb in 13 x 9 inch cake pan. Sprinkle Jello, sugar and marshmallows (in this order) over rhubarb. Prepare cake mix according to package directions and spread over. Bake at 350 degrees for 1 hour. Top with whipped cream if desired.