Easy Rhubarb Dump Cake (The Simplest Rhubarb Dessert Ever)

The Easiest Rhubarb Dessert You Will Ever Make

If your garden is overflowing with rhubarb and you are staring at those ruby-red stalks wondering what to do with rhubarb this season, stop overthinking it. This rhubarb dump cake is the answer. Tangy, bubbling rhubarb on the bottom, a golden buttery cake crust on top, and absolutely zero mixing required. You just layer, dot with butter, and bake. That's it.

This is the kind of recipe that becomes a summer staple. It is warm and homey, deeply satisfying, and shockingly easy given how impressive it looks coming out of the oven. Whether you are cooking with fresh stalks from the farmers market or pulling a bag of frozen rhubarb out of the freezer in January, this recipe delivers every single time.

Why This Rhubarb Dump Cake Works So Well

Dump cakes are one of the great unsung heroes of American home baking. The concept is brilliantly simple: layer fruit on the bottom, pour dry cake mix on top, add butter, and let the oven do the heavy lifting. The butter melts down through the cake mix as it bakes, creating a crispy, crumbly, almost shortbread-like crust while the fruit beneath turns into a glossy, jammy filling.

Rhubarb is a perfect candidate for this treatment. Its natural tartness balances beautifully against the sweetness of the cake mix and sugar, and the strawberry gelatin gives the filling a gorgeous pink color and just a hint of berry flavor that feels completely natural alongside the rhubarb.

Chef's Tip: Cold butter is your best friend here. Slice it into thin, even pats and space them out as much as possible over the dry cake mix. The goal is even coverage so every bite gets that golden, buttery top.

Fresh vs. Frozen Rhubarb: Both Work Beautifully

One of the best things about easy rhubarb recipes like this one is that they work just as well with frozen rhubarb as they do with fresh. This is genuinely one of the best frozen rhubarb recipes for baking because the texture of the rhubarb softens completely during baking anyway, so you lose nothing by starting from frozen.

If you are using frozen rhubarb, just remember two things:

• Thaw it fully before assembling the dish
• Drain off excess liquid so the filling does not turn soupy

Fresh rhubarb can go straight into the pan with no pre-treatment needed.

Having the right baking dish makes a real difference with dump cakes. A heavy ceramic or glass 9x13 dish distributes heat more evenly than a thin metal pan, which helps that topping go perfectly golden without burning the edges.

Tips for the Best Easy Rhubarb Dessert

This recipe is almost foolproof, but a few small details will take it from good to absolutely unforgettable:

• Do not stir the layers. The whole magic of a dump cake is in the distinct layers. Resist the urge.
• Cover your butter. After about 30 minutes of baking, peek inside. If you see dry white patches of cake mix on top, gently nudge a butter pat over them or drizzle a tiny bit of melted butter. This ensures an even, golden crust.
• Let it rest. It is incredibly tempting to dig in immediately, but giving it 15 minutes to settle allows the filling to thicken up and the topping to firm slightly.
• Serve it warm with a generous scoop of vanilla ice cream. The cold creaminess against the hot, bubbling rhubarb filling is one of life's simple pleasures.

Ready to make the easiest rhubarb easy recipe of your summer? Here is everything you need:

Easy Rhubarb Dump Cake (The Simplest Rhubarb Dessert Ever)

This easy rhubarb dump cake comes together in minutes with just a handful of pantry ingredients and fresh or frozen rhubarb. A buttery, golden cake topping over tangy-sweet rhubarb filling makes this the ultimate quick rhubarb dessert.

Prep:10 mins

Cook:50 mins

Total:60 mins

Yield:9 servings

Cuisine:American

Yield: 9 servingsCalories: 380Protein: 3g

Carbs: 58gFat: 16gSat. Fat: 10gFiber: 1gSugar: 38gSodium: 310mg

Ingredients

Units

USM

Scale

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• 5 cups fresh or frozen rhubarb, chopped into 0.5-inch pieces, thawed and drained if frozen
• 1 cup granulated sugar, for the rhubarb base
• 3 oz strawberry gelatin powder, one standard box, dry and unmixed
• 15 1/4 oz yellow cake mix, one standard box, dry and unmixed
• 1/2 cup unsalted butter, sliced into thin pats, cold
• 1/2 cup water, cold

Instruction

1

Preheat your oven to 350 degrees F (175 degrees C). Lightly grease a 9x13-inch baking dish with butter or nonstick spray.

2

Spread the chopped rhubarb evenly across the bottom of the prepared baking dish in a single layer.

3

Sprinkle the granulated sugar evenly over the rhubarb, then sprinkle the dry strawberry gelatin powder over the sugar. Do not stir.

4

Pour the cold water evenly over the rhubarb layer.

5

Open the dry cake mix and sprinkle it evenly over the entire surface, covering the rhubarb layer completely. Do not stir.

6

Lay the cold butter pats evenly across the top of the dry cake mix, spacing them so they cover as much surface area as possible.

7

Bake uncovered for 45 to 55 minutes, until the top is golden brown and the edges are bubbling. If some dry spots remain on top, push a butter pat over them and bake an additional 5 minutes.

8

Remove from the oven and allow to cool for at least 15 minutes before serving. Serve warm with a scoop of vanilla ice cream or a dollop of whipped cream.

Equipment

• 9x13-inch baking dish
• Cutting board and knife
• Measuring cups and spoons
• Oven

Notes

Storage: Cover leftovers tightly and refrigerate for up to 4 days. Reheat individual portions in the microwave for 45 to 60 seconds. Make-ahead tip: You can assemble the layers the night before, cover with plastic wrap, and refrigerate unbaked. Add 5 minutes to the bake time if going straight from the fridge to the oven. For a richer topping, use a butter cake or white cake mix instead of yellow. If your rhubarb is especially tart, add an extra 2 tablespoons of sugar to the base layer.

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Serving, Storing, and Variations

Serving: This cake is best served warm, straight from the pan. Vanilla ice cream is the classic pairing, but lightly sweetened whipped cream or even a drizzle of heavy cream works beautifully too.

Storing: Cover the pan tightly with plastic wrap or foil and refrigerate for up to 4 days. Reheat individual portions in the microwave for 45 to 60 seconds.

Easy variations to try:

• Strawberry rhubarb dump cake: Add 1 cup of sliced fresh strawberries to the rhubarb layer for a classic flavor pairing
• White cake mix: Swap the yellow cake mix for white for a slightly lighter, more delicate topping
• Raspberry rhubarb: Use raspberry gelatin instead of strawberry for a deeper berry note

However you make it, this easy rhubarb dessert is guaranteed to become one of those recipes you come back to every single year when the rhubarb comes back in season.