This Rhubarb Dump Cake recipe I got from Pinterest and I was interested in it because it's super easy to make. You layer everything in a dish and bake, you don't mix or anything. I really liked this cake. I found it a touch sweet and I thought it was a bit runny. It definitely could have set a bit more but I do find rhubarb to be watery and that makes these desserts a bit more runny then you may want but they taste great so I just go with it.
I definitely recommend giving this recipe a try and if you want to be more adventurous you can play with your flavours, maybe try raspberry jello and lemon flavoured cake.
I got this recipe from http://youpinspireme.ca/strawberry-rhubarb-dump-cake/
5-6 cups of fresh, raw rhubarb, chopped (small pieces)
1/2 cup sugar
1 package of strawberry Jello mix, unprepared
1 yellow or vanilla box cake mix, unprepared
1 cup water
1/3 cup melted butter
Preheat oven to 350. Grease a 9x13 pan.
Spread rhubarb on bottom of prepared pan.
Spread the dry cake mix over the rhubarb/sugar/jello.
Bake in 350 oven for 45-60 minutes, until cake top is golden.
Let it cool for at least 60 minutes before cutting. The jello needs time to set. IN fact I even let mine cool for 60 minutes and then placed in the fridge for another 60 minutes or so before serving. I still found it a bit runny but it was definitely better then what it would have been had I not waited.