Rhubarb Dump Cake

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Rhubarb Dump Cake only requires 6 ingredients and 10 minutes of prep time. Made with a yellow cake mix and strawberry Jello for a delicious spring dessert. 

Rhubarb Dump Cake

One last rhubarb post for the year for you! I needed to feed a church group and was running out of time.

So I made this easy rhubarb dump cake with a box of yellow cake mix, some rhubarb, and a handful of other ingredients.

I keep a couple boxes of cake mix on hand for dump cakes like this one and also for the Easy Black Forest Cake. They’re both made with simple pantry ingredients and a minimum of fuss.

My friends loved it and there wasn’t a single serving left over. It was such a hit, I decided this recipe needed a permanent home on the blog with all the other rhubarb recipes.

There are many variations of rhubarb dump cake on the internet, some use strawberry jello and some don’t.

Much like my grandmother’s Rhubarb Sauce, I personally love the strawberry flavor with the tart rhubarb.

Rhubarb Dump Cake is a sweetly tangy treat.

Rhubarb Dump Cake

For those of you who’ve never made a dump cake, the basic concept is that you’ll dump all the ingredients into a greased pan and bake. No mixing bowl needed.

For this strawberry rhubarb dump cake you’ll need the following ingredients:

  • 4 cups of diced rhubarb
  • 1/2 cup sugar
  • 1 (3 oz) box of strawberry Jello
  • yellow cake mix
  • 1/2 cup butter
  • 3/4 cup water
Rhubarb Dump Cake Ingredients

How To Make A Rhubarb Dump Cake

Start by preheating your oven and greasing a 9 x 13 inch pan. Then spread the diced rhubarb on the bottom of the pan, sprinkle with the sugar and dry strawberry Jello.

Next sprinkle on the dry cake mix. Then melt the butter and stir in the warm water and pour over the top of the dry cake mix.

Bake for about 35-45 minutes. It’s best served warm with whipped cream or vanilla ice cream.

Tips for Perfect Dump Cakes

Using the method of dumping everything into the pan will probably result in a few pockets of dry cake mix. My pumpkin dump cake recipe illustrates this method.

If you don’t care for the occasional bit of dry cake mix (some people do and some don’t). My advice is to grab a mixing bowl and stir together the cake mix, melted butter, and water together before spreading over the rhubarb in the pan.

This will yield a more uniform textured cake. Is it still “technically” a dump cake? Who knows, but it sure is delicious.

Rhubarb Cake with yellow cake mix and jello is a winner!

Can you use frozen rhubarb?

Yes, rhubarb freezes great, so when it’s in season, grab a couple of extra bunches and dice them up and freeze them to use in the winter when you’re craving a springy rhubarb dessert.

If you choose to use frozen rhubarb, thaw the rhubarb first and let any excess liquid drain off. Don’t squeeze any liquid out, just drain what naturally thaws out of the rhubarb. Then use as you would fresh rhubarb in the recipe.

Rhubarb Cake with Whipped Cream

Rhubarb Dessert Recipes

Here are some of my other favorite rhubarb dessert recipes:

And a few more rhubarb recipes I would love to try:

Rhubarb Freezer Jam from Hoosier Homemade.

Raspberry Rhubarb Crisp from Pumpkin N Spice

Triple Berry Rhubarb Pancake Sauce from Pressure Cooking Today

Rhubarb Dump Cake is a sweetly tangy treat.

Rhubarb Dump Cake

This rhubarb dump cake only requires 6 ingredients and 10 minutes of prep time. Made with a yellow cake mix and strawberry Jello for a delicious spring dessert.
Prep Time: 10 mins
Cook Time: 45 mins
Total Time: 55 mins
Course: Recipes
Cuisine: American
Servings: 10 servings

Ingredients 

  • 4 cups finely diced rhubarb see note at the bottom on how to use frozen rhubarb
  • 1/2 cup granulated sugar
  • 1 3 ounce box of Strawberry Jello
  • 1 yellow cake mix unprepared
  • 1/2 cup butter melted
  • 3/4 cup warm water
  • Whipped cream or vanilla ice cream for serving

Instructions

  • Preheat oven to 350° F. Grease a 9 x 13 inch baking dish. Spread the diced rhubarb in the pan. Sprinkle with the sugar and dry strawberry jello.
  • Sprinkle on the dry cake mix. Melt the butter in the microwave and stir in the warm water. Pour over the dry cake mix. Do NOT stir.
  • Bake in preheated oven for 40-45 minutes or until lightly browned. Remove and let cool slightly. It’s best served warm with whipped cream or vanilla ice cream.

Notes

If you choose to use frozen rhubarb, thaw the rhubarb first and let any excess liquid drain off. Don’t squeeze any liquid out, just drain what naturally thaws out of the rhubarb. Then use as you would fresh rhubarb in the recipe. 
Using the method of dumping everything into the pan will probably result in a few pockets of dry cake mix. (My pumpkin dump cake recipe shows this.) If you don’t like an occasional bit of dry cake mix (some people do and some don’t). My advice would be to grab a mixing bowl and stir together the cake mix, melted butter and water together before spreading over the rhubarb in the pan. 

Nutrition

Serving: 1piece · Calories: 335kcal · Carbohydrates: 57g · Protein: 3g · Fat: 11g · Saturated Fat: 7g · Polyunsaturated Fat: 3g · Cholesterol: 24mg · Sodium: 467mg · Fiber: 2g · Sugar: 35g
Tried this recipe?Mention @chocolatewithgrace or tag #chocolatewithgrace!

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{originally published 6/12/19 – recipe notes and photos updated 6/8/21}

Rhubarb Dump Cake is a summer favorite.

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