Rhubarb Dump Cake

Table of Contents

1. Ingredients
2. Substitutions and Additions
3. How to Make Rhubarb Dump Cake
4. How To Serve Rhubarb Dump Cake
5. Why You'll Love This Recipe for Rhubarb Dump Cake
6. Recipe FAQ
7. Serving FAQ
8. Storage FAQ
9. JUMP TO RECIPE

This rhubarb dump cake is sweet, tart, and topped with golden, buttery cake mix for the easiest dessert ever. You’ll only need a few simple ingredients and just minutes to prep. Bake it until the top turns golden and the filling bubbles. Serve it warm with whipped cream or ice cream.

Follow the guide below for step-by-step directions and helpful photos that walk you through the recipe. We’ve also included smart tips, easy tricks, and answers to the most frequently asked questions so everything turns out just right.

This rhubarb dump cake recipe uses fresh rhubarb, dry cake mix, and pantry staples for a sweet and tangy dessert. The fruit bakes down soft while the topping turns golden and crisp.

Bring it to potlucks, holiday dinners, or casual get-togethers—everyone goes back for seconds. The rich topping and juicy rhubarb make each bite feel special.

NOTE: It is essential to ensure that you do not eat the leaves, root, or bottom stem area of rhubarb, as it will make you sick.

What you’ll need to make this rhubarb dump cake recipe:

• 4 cups (1-1¼ pounds) fresh rhubarb, small diced
• 1½ cups granulated sugar
• 2 tablespoons cornstarch
• 1 teaspoon vanilla extract
• 1 cup water, divided
• 1 (15.25-ounce) box yellow cake mix (I used Betty Crocker)
• 1 cup unsalted butter, melted

Personalize your rhubarb cobbler cake by swapping out ingredients and adding tasty extras! These easy changes let you make it your own. Here are some top substitutions and additions:

Substitute Cake Mix: Use yellow, white, or strawberry cake mix for a fun flavor change in your rhubarb dump cake.
Add Strawberries: Mix in chopped strawberries with the rhubarb for a sweeter, berry-filled fruit layer.
Substitute Walnuts: Swap out pecans for chopped walnuts if you want a slightly different crunch on top.
Add Cinnamon: Sprinkle cinnamon over the cake mix before baking to add warm, spiced flavor to the topping.
Substitute Butter: Use margarine instead of butter if that’s what you have on hand—it still gives a rich topping.

Follow our step-by-step photos to make this rhubarb dessert recipe from start to finish without stress. Check out the tips and tricks below to help everything bake up just right. Let’s get started!

FIRST STEP: Preheat the oven to 375°F. Spray a 9×13 pan with baking spray. Set aside.

SECOND STEP: Combine the diced rhubarb, white sugar, ½ cup water, cornstarch, and vanilla extract in a large bowl. Stir to combine evenly. Pour the fruit mixture into the bottom of the baking dish.

THIRD STEP: Evenly sprinkle the box of cake mix over the top of the rhubarb mixture. If needed, you can spread the cake mix to ensure that all the fruit is covered in an even layer.

FOURTH STEP: Drizzle the remaining ½ cup of water evenly over top of the dry cake mix.

FIFTH STEP: Carefully drizzle the melted butter evenly over the water and yellow cake mix.

SIXTH STEP: Bake for 45 minutes or until golden brown and bubbly. Remove the rhubarb dump cake from the oven and allow it to rest on the counter for 15 minutes before serving.

You can serve this easy rhubarb dump cake in so many fun ways all year long. It’s perfect for family dinners, parties, and spring desserts.

• Spring and summer get-togethers: Rhubarb season makes this cake perfect for warm-weather gatherings. Serve it with chocolate chip ice cream or strawberry crunch poke cake for a fruity dessert table.
• Weeknight family dessert: Kids and grown-ups both love the sweet topping and soft baked fruit. Pair it with peanut butter chocolate chip lasagna or lemon brownies for a dessert everyone will enjoy.
• Holiday potlucks or picnics: Bring this dump cake to Easter or Fourth of July picnics—it travels well and tastes great warm or chilled. Add peanut butter cookies or coconut cheesecake bites for an easy mix of treats.

This quick rhubarb dump cake has become a favorite because it’s easy, full of sweet-tart flavor, and always a crowd-pleaser. It brings back memories of spring baking and makes dessert simple, fun, and stress-free.

Easy to Make: You just layer the ingredients and bake—no mixing bowls or fancy tools needed.

Perfect for Spring: Fresh rhubarb shines in this recipe, making it a go-to during rhubarb season every year.

Great for Sharing: You can slice it warm or chilled, so it works well for potlucks, family dinners, or bake sales.

Customizable: You can switch up the cake mix or add fruit without changing the simple steps.

Quick Prep: It comes together fast, which means you spend less time baking and more time enjoying dessert.

This rhubarb dump cake keeps things simple, fun, and always worth baking again.

Can I use frozen rhubarb to make rhubarb dump cake?
Yes, you can use frozen rhubarb for this rhubarb dump cake. Thaw it first and drain any extra liquid before baking.

Do I need to mix the cake mix with eggs or milk?
No, don’t mix the cake mix. Just sprinkle it dry over the fruit and let the butter melt through it while baking.

Do I need to stir the ingredients before baking?
No, you don’t need to stir the layers. Just add each one in order and bake—it all comes together in the oven.

Can I add other fruit to rhubarb dump cake?
Yes, you can mix in strawberries or raspberries for extra sweetness and color without changing the baking time.

How do I know when the rhubarb dump cake is done?
You’ll know the dump cake is ready when the top turns golden brown and the edges bubble with hot fruit.

Can I use a glass baking dish for this recipe?
Yes, a glass baking dish works well. Just make sure it’s 9x13 inches so everything bakes evenly and cooks through.

Should I serve rhubarb dump cake warm or cold?
Serve warm for a soft, gooey texture. Let it chill if you prefer a firmer, more set topping.

Can I serve this dump cake right from the baking dish?
Yes, you can serve it straight from the pan. Just use a big spoon and scoop it into bowls or plates.

Is rhubarb dump cake good for holidays or special events?
Yes, this dessert works great for spring holidays and family events. It’s easy to serve and everyone loves the sweet-tart flavor.

Do kids like rhubarb dump cake?
Yes, kids usually enjoy the sweet cake topping. The rhubarb’s tartness balances out with sugar and makes it taste just right.

What are the best toppings for rhubarb cake?
Add whipped cream, vanilla ice cream, or powdered sugar on top. These toppings pair well with the warm, fruity filling.

Follow the directions, tips, and tricks below to keep your rhubarb dessert cobbler fresh and ready to enjoy later. Learn how to store leftovers the right way, so the buttery topping stays crisp and the fruity filling stays sweet.

Can I prepare rhubarb dump cake ahead of time?
Yes, bake the cake the day before and keep it covered in the fridge until you're ready to serve.

What’s the best way to store leftover rhubarb dump cake?
Store leftovers in an airtight container or cover the baking dish tightly with plastic wrap. Keep it refrigerated for up to four days.

Is it possible to freeze rhubarb dump cake?
Yes, you can freeze baked dump cake in a freezer-safe container. For best texture, eat within one month.

How should I reheat rhubarb dump cake when ready to serve?
Use the oven for best results. Heat the cake uncovered at 325°F for ten to fifteen minutes or until warmed through.

Can I reheat rhubarb dump cake in the microwave?
Yes, microwave individual servings for thirty seconds at a time. Add whipped cream or ice cream after reheating.