- 1 (18.25 ounce) package yellow cake mix
- 6 cups chopped rhubarb
- 1 cup white sugar
- 3 cups miniature marshmallows
Preheat oven to 350 degrees F (175 degrees C). Grease a 9×13 inch pan.
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Place chopped rhubarb on the bottom of greased 9×13 inch pan. Sprinkle sugar evenly over rhubarb. Sprinkle marshmallows over rhubarb and sugar.
Prepare cake mix according to instructions on package. Pour over rhubarb and marshmallows in pan.
Bake at 350 degrees F (175 degrees C) for 1 hour. Cool in pan for 10 minutes, then invert onto serving dish so that rhubarb is on top.