Preheat oven to 350.
Spray a 9x13 baking pan with non-stick pan spray.
Spread the chopped rhubarb in the bottom of the prepared pan.
4 Cups Rhubarb
Sprinkle the cinnamon and nutmeg over the rhubarb.
1 Teaspoon Cinnamon, ¼ Teaspoon Nutmeg
Cover the rhubarb evenly with sugar.
1 Cup Sugar
Sprinkle the cake mix over the rhubarb and sugar. Do not press or stir.
1 box Cake mix
Sprinkle the water over the cake mix to moisten it.
1 Cup Water
Drizzle the melted butter over the remaining dry parts of the cake mix.
½ Cup Butter
Cover with foil and bake for 45 minutes. Remove foil and bake an additional 15 minutes or until the top of the cake is golden brown and crunchy.
Remove from the oven and serve with ice cream and/or whipped cream.