1 white or yellow cake mix
4 c. finely cut rhubarb
2/3 c. sugar
1 box Jello (3 oz.), strawberry, raspberry or cherry
2 c. miniature marshmallows

Spread rhubarb in bottom of 9x13 pan. Sprinkle with sugar, Jello powder. Spread marshmallows over this. Mix cake mix as directed on package. Pour over mixture. Bake 45 minutes at 350. Serve with whipped cream.