Rhubarb Dump Cake

3-Ingredient Rhubarb Dump Cake: Effortless Dessert Magic

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Written by PureCookingJoy

May 18, 2025

Oh, do I have a treat for you! This rhubarb dump cake is my go-to when I need something delicious but don’t want to fuss in the kitchen. It’s the kind of recipe that makes people think you slaved away for hours, when really, you just dumped everything in a pan and let the oven do the magic. The tart rhubarb gets perfectly sweet, the cake mix turns golden and crisp on top, and that melted butter? Pure heaven. Trust me, this is the easiest way to turn a few simple ingredients into a dessert that’ll have everyone begging for seconds.

Why You’ll Love This Rhubarb Dump Cake

Let me count the ways this dessert will become your new best friend:

  • Effortless magic: Just layer, dump, and bake – no mixing bowls required!
  • Quick fix: From fridge to oven in under 10 minutes flat.
  • Foolproof: Even if you’ve never baked before, you can’t mess this up.
  • Crowd-pleaser: That perfect sweet-tart combo makes everyone happy.
  • Versatile: Serve warm, cold, with ice cream – it’s always delicious.

Honestly, I make this when I want to look like a baking pro without any of the stress. The rhubarb does all the work for you!

Ingredients for Rhubarb Dump Cake

Here’s all you need to make this magical dessert happen – simple ingredients that transform into something extraordinary:

  • 4 cups chopped rhubarb – fresh is best (about 6-8 stalks, trimmed and cut into ½-inch pieces)
  • 1 cup granulated sugar – this balances the rhubarb’s natural tartness perfectly
  • 1 box yellow cake mix – the 15.25 oz size works great (any brand you like!)
  • ½ cup unsalted butter – melted until just liquid (I microwave it in 30-second bursts)
  • ½ cup water – just enough to help everything come together

See? Nothing fancy – just pantry staples that create pure magic when they meet in the oven!

How to Make Rhubarb Dump Cake

Okay, let’s get to the fun part – making this ridiculously easy dessert! I promise, if you can layer ingredients, you can make this showstopper. Here’s exactly how I do it every time:

Step 1: Prep the Rhubarb

First, grab your baking dish (I use a trusty 9×13-inch pan) and spread those beautiful pink rhubarb pieces evenly across the bottom. Don’t worry about perfection – just make sure there aren’t any big empty spots. The rhubarb will soften and bubble up beautifully as it bakes!

Step 2: Add Sugar and Cake Mix

Now for the magic layers! Sprinkle the sugar evenly over the rhubarb – this helps balance that wonderful tartness. Then, take your cake mix and just… dump it right on top! No stirring needed. I like to gently shake the pan to distribute it evenly, but your fingers work great too.

Step 3: Drizzle Butter and Bake

Here comes the golden touch – slowly drizzle that melted butter over everything, trying to cover as much of the cake mix as possible. Then add the water the same way. Pop it in your preheated 350°F oven for 45-50 minutes. You’ll know it’s done when the top is golden brown and you see those gorgeous ruby-red rhubarb juices bubbling up around the edges. Oh, that smell!

Tips for the Perfect Rhubarb Dump Cake

After making this rhubarb dump cake more times than I can count, I’ve picked up some foolproof tricks to make it absolutely perfect every time:

  • No mixing allowed! Seriously – the magic happens when you don’t stir. Those layers need to stay separate to create that perfect crispy top and juicy bottom.
  • Check for doneness when you see the edges bubbling and the top looks like a golden brown crumble – that’s your cue it’s ready.
  • Let it rest for 10-15 minutes before serving. I know it’s hard to wait, but this helps the juices thicken up just right.
  • Go big with toppings! A scoop of vanilla ice cream melts into the warm cake beautifully, or try whipped cream for extra indulgence.

Trust me, these little touches take an already amazing dessert to the next level!

Rhubarb Dump Cake Variations

Oh, the fun part – making this recipe your own! My favorite twist is adding 2 cups of sliced strawberries with the rhubarb for a classic strawberry-rhubarb combo. Feeling fancy? Toss in a handful of chopped pecans or walnuts with the cake mix for crunch. Sometimes I’ll swap the yellow cake mix for spice cake when I want extra warmth. The possibilities are endless – that’s the beauty of dump cakes!

Serving and Storing Rhubarb Dump Cake

Here’s the best part – digging in! I always serve this rhubarb dump cake warm, right out of the oven if possible. The contrast between the crispy golden top and that tart, juicy rhubarb underneath is just heavenly. A scoop of vanilla ice cream melting over the top? Absolute perfection. For leftovers (if you’re lucky enough to have any!), just cover the dish with foil or transfer slices to an airtight container. It keeps beautifully in the fridge for 3 days – though I doubt it’ll last that long!

Rhubarb Dump Cake Nutrition Information

Here’s the scoop on what’s in each delicious serving (based on 12 slices): about 250 calories with that perfect balance of sweet and tart. Remember, nutritional values are estimates and can vary based on your specific ingredients and any tasty tweaks you make!

FAQs About Rhubarb Dump Cake

I get asked about this recipe all the time, so let me answer the most common questions that pop up:

Can I use frozen rhubarb?

Absolutely! Just thaw it first and drain any excess liquid – you don’t want a soggy cake. I actually keep frozen rhubarb on hand just for this recipe when it’s not in season.

What if I don’t have yellow cake mix?

No worries! White or even spice cake mix works great too. The spice cake adds a lovely warmth that pairs beautifully with the tart rhubarb.

Why is my dump cake soggy?

Usually means you stirred it (oops!) or didn’t bake it long enough. Remember – no mixing! And make sure that top is golden brown before taking it out.

Can I make this ahead?

You bet! Assemble it, cover, and refrigerate overnight. Just add 5-10 minutes to the baking time since it’ll be going in cold.

Share Your Rhubarb Dump Cake Experience

I’d love to hear how your rhubarb dump cake turns out! Did you add any fun twists? Leave a comment below or tag me on social media – nothing makes me happier than seeing your delicious creations. Happy baking!

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3-Ingredient Rhubarb Dump Cake: Effortless Dessert Magic

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A simple and delicious rhubarb dump cake that requires minimal effort but delivers maximum flavor. Perfect for any occasion.

  • Author: PureCookingJoy
  • Prep Time: 10 minutes
  • Cook Time: 50 minutes
  • Total Time: 1 hour
  • Yield: 12 servings 1x
  • Category: Dessert
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian

Ingredients

Scale
  • 4 cups chopped rhubarb
  • 1 cup granulated sugar
  • 1 box yellow cake mix
  • 1/2 cup unsalted butter, melted
  • 1/2 cup water

Instructions

  1. Preheat your oven to 350°F (175°C).
  2. Spread the chopped rhubarb evenly in a greased 9×13-inch baking dish.
  3. Sprinkle the sugar over the rhubarb.
  4. Pour the dry cake mix evenly over the rhubarb and sugar.
  5. Drizzle the melted butter and water over the cake mix.
  6. Bake for 45-50 minutes, or until the top is golden brown and the rhubarb is bubbly.
  7. Let cool slightly before serving.

Notes

  • You can add strawberries for a strawberry-rhubarb variation.
  • Serve warm with vanilla ice cream for extra indulgence.
  • Store leftovers in an airtight container in the fridge for up to 3 days.

Nutrition

  • Serving Size: 1 slice
  • Calories: 250
  • Sugar: 30g
  • Sodium: 300mg
  • Fat: 10g
  • Saturated Fat: 6g
  • Unsaturated Fat: 3g
  • Trans Fat: 0g
  • Carbohydrates: 40g
  • Fiber: 2g
  • Protein: 2g
  • Cholesterol: 20mg

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