Finding a simple dessert that doesn’t require a box of Jello might seem like a tall order, especially when you’re craving something sweet but don’t want to make extra trips to the store. Most rhubarb dump cake recipes call for Jello as a shortcut, but what if you’re out of it, or you simply prefer to skip the artificial flavors and colors?
That’s where this rhubarb dump cake without Jello comes in handy. It uses fresh rhubarb, warm spices, and a box of cake mix to create a dessert that’s just as easy to throw together, tastes even better, and lets the natural tangy flavor of rhubarb really shine through.
Why You’ll Love This Rhubarb Dump Cake
- Super simple preparation – This dump cake lives up to its name – just layer the ingredients in a pan and bake. No mixing bowls or complicated steps required.
- No jello needed – Unlike many dump cake recipes, this one skips the jello and lets the natural tartness of fresh rhubarb shine through with just the right amount of sweetness.
- Minimal ingredients – With just seven basic ingredients, this is one of those recipes you can make without a special trip to the grocery store.
- Perfect spring dessert – This cake is a great way to use up rhubarb from your garden or the farmers market, and it fills your kitchen with the warm smell of cinnamon and nutmeg.
- Ready in just over an hour – From start to finish, you’ll have a warm, bubbly dessert on the table in about 70 minutes with hardly any effort on your part.
What Kind of Rhubarb Should I Use?
Fresh rhubarb is always your best bet for this dump cake, and you’ll want to look for stalks that are firm and crisp with a nice pink or red color. That said, frozen rhubarb works just fine too – just make sure to thaw it first and drain off any excess liquid so your cake doesn’t get soggy. Whether you go with red or green rhubarb, both will taste great, though the red varieties tend to look a bit prettier in the finished cake. Before using your rhubarb, trim off the leaves (they’re actually toxic) and the bottom ends, then chop the stalks into roughly 1-inch pieces for even baking.
Options for Substitutions
This simple dump cake is forgiving when it comes to swaps:
- Rhubarb: Fresh or frozen rhubarb both work great here. You can also mix rhubarb with strawberries (use 2 cups of each) for a classic combination, or try it with raspberries or blueberries.
- Cake mix: Yellow cake mix is the standard choice, but white cake mix, vanilla, or even spice cake mix will work just fine. Stick with a standard 15-16 ounce box for best results.
- Butter: You can use margarine instead of butter if that’s what you have on hand. The texture will be slightly different but still tasty.
- Sugar: If your rhubarb is particularly tart, you might want to add an extra 1/4 cup of sugar. On the flip side, if you’re watching sugar intake, you can reduce it to 3/4 cup, though the dessert will be more tart.
- Spices: Don’t have nutmeg? Just use cinnamon alone, or try adding a pinch of ginger or cardamom for a different flavor profile.
Watch Out for These Mistakes While Baking
The biggest mistake people make with dump cakes is stirring the ingredients together – resist the urge to mix anything, as the magic happens when the dry cake mix absorbs the moisture from below and creates that signature crispy-tender texture.
Another common error is cutting your rhubarb pieces too large, which can lead to uneven cooking and overly tart bites, so aim for 1/2-inch chunks that will soften properly during baking.
Make sure to drizzle the melted butter evenly across the entire surface of the cake mix rather than pouring it in one spot, which ensures every bite gets that golden, crispy top layer.
Finally, don’t skip the covered baking time in the first 45 minutes – this step steams the rhubarb and helps it release its juices, which then soak up into the cake mix to create the gooey middle layer that makes this dessert so good.
What to Serve With Rhubarb Dump Cake?
This rhubarb dump cake is pretty rich and sweet on its own, so I always serve it with a big scoop of vanilla ice cream to balance out the tartness of the rhubarb. The cold ice cream melting into the warm cake is honestly the best part. If you’re not an ice cream person, a dollop of whipped cream or even some plain Greek yogurt works great too. I also like to brew a pot of coffee or tea to serve alongside since the cake is on the sweeter side, and it makes for a nice afternoon treat or after-dinner dessert.
Storage Instructions
Store: Keep any leftover rhubarb dump cake covered with foil or plastic wrap at room temperature for up to 2 days. If you want it to last longer, store it in an airtight container in the fridge for up to 5 days.
Freeze: This cake freezes really well for up to 3 months. Just cut it into individual portions, wrap each piece in plastic wrap, then place them in a freezer bag. That way you can grab a piece whenever you’re craving something sweet.
Serve: If you’re eating it from the fridge, you can enjoy it cold or warm it up in the microwave for about 30 seconds. Frozen slices can thaw at room temperature for an hour, or you can microwave them for a minute or two until warmed through.
| Preparation Time | 10-15 minutes |
| Cooking Time | 60 minutes |
| Total Time | 70-75 minutes |
| Level of Difficulty | Easy |
| Servings | 8 slices |
Estimated Nutrition
Estimated nutrition for the whole recipe (without optional ingredients):
- Calories: 2800-3100
- Protein: 15-20 g
- Fat: 70-80 g
- Carbohydrates: 540-600 g
Ingredients
For the fruit base:
- 5 cups rhubarb (sliced into 1/2-inch thick pieces for even softening)
- 1.25 tsp cinnamon (freshly ground preferred for more aroma)
- 0.5 tsp nutmeg
- 0.75 cup sugar
- 1/2 tsp vanilla extract
For the cake topping:
- 1 box cake mix (I always use Betty Crocker Super Moist Yellow)
- 1 cup water
- 0.75 cup butter (I like Kerrygold unsalted butter for this richness)
- 1/4 tsp salt
Step 1: Prepare the Pan and Preheat
Preheat your oven to 350°F and generously grease a 9×13 inch baking dish (or similar size) with butter or cooking spray.
A well-greased pan ensures easy serving and prevents sticking.
Step 2: Layer the Rhubarb Base with Spices and Sugar
- 5 cups rhubarb
- 1.25 tsp cinnamon
- 0.5 tsp nutmeg
- 0.75 cup sugar
Spread the sliced rhubarb evenly across the bottom of your prepared baking dish.
Sprinkle the cinnamon and nutmeg directly over the rhubarb—I find freshly ground spices make a noticeable difference in aroma and flavor.
Then scatter the sugar evenly over everything.
This layering approach allows the spices to coat the fruit properly and the sugar to begin drawing out the rhubarb’s juices as the cake bakes.
Step 3: Mix and Distribute the Cake Layer
- 1 box cake mix
Pour the dry cake mix directly over the rhubarb and sugar layer, spreading it evenly with a spatula or the back of a spoon.
Don’t stir—you want distinct layers.
The dry cake mix will absorb the moisture from the fruit and butter as it bakes, creating that signature ‘dump cake’ texture.
Step 4: Add Moisture and Fat to Create the Cake
- 1 cup water
- 0.75 cup butter
- 0.5 tsp vanilla extract
In a small bowl or measuring cup, combine the water and vanilla extract, then drizzle this mixture evenly over the dry cake mix.
Melt the butter separately (in the microwave for 1-2 minutes or on the stovetop) and drizzle it evenly over the top as well.
I like using quality butter like Kerrygold because the richness really elevates the final cake.
Don’t stir—the cake mix will hydrate and rise as it bakes.
Step 5: Bake Covered, Then Uncover to Finish
- 1/4 tsp salt
Cover the baking dish with foil (to trap steam and keep the top from browning too quickly) and bake for 45 minutes.
Then remove the foil and bake uncovered for an additional 15 minutes, allowing the top to lightly brown and develop some color.
The total 60 minutes ensures the cake is fully cooked and the rhubarb has softened into a jammy filling beneath the spongy cake layer.
Step 6: Cool Slightly and Serve
Let the dump cake rest for 5-10 minutes before serving—this allows it to set slightly so it holds together better when plated.
Serve warm with a scoop of vanilla ice cream or a dollop of whipped cream to complement the tart rhubarb and sweet cake.
Tasty Rhubarb Dump Cake Without Jello
Ingredients
For the fruit base::
- 5 cups rhubarb (sliced into 1/2-inch thick pieces for even softening)
- 1.25 tsp cinnamon (freshly ground preferred for more aroma)
- 0.5 tsp nutmeg
- 0.75 cup sugar
- 1/2 tsp vanilla extract
For the cake topping::
- 1 box cake mix (I always use Betty Crocker Super Moist Yellow)
- 1 cup water
- 0.75 cup butter (I like Kerrygold unsalted butter for this richness)
- 1/4 tsp salt
Instructions
- Preheat your oven to 350°F and generously grease a 9x13 inch baking dish (or similar size) with butter or cooking spray. A well-greased pan ensures easy serving and prevents sticking.
- Spread the sliced rhubarb evenly across the bottom of your prepared baking dish. Sprinkle the cinnamon and nutmeg directly over the rhubarb—I find freshly ground spices make a noticeable difference in aroma and flavor. Then scatter the sugar evenly over everything. This layering approach allows the spices to coat the fruit properly and the sugar to begin drawing out the rhubarb's juices as the cake bakes.
- Pour the dry cake mix directly over the rhubarb and sugar layer, spreading it evenly with a spatula or the back of a spoon. Don't stir—you want distinct layers. The dry cake mix will absorb the moisture from the fruit and butter as it bakes, creating that signature 'dump cake' texture.
- In a small bowl or measuring cup, combine the water and vanilla extract, then drizzle this mixture evenly over the dry cake mix. Melt the butter separately (in the microwave for 1-2 minutes or on the stovetop) and drizzle it evenly over the top as well. I like using quality butter like Kerrygold because the richness really elevates the final cake. Don't stir—the cake mix will hydrate and rise as it bakes.
- Cover the baking dish with foil (to trap steam and keep the top from browning too quickly) and bake for 45 minutes. Then remove the foil and bake uncovered for an additional 15 minutes, allowing the top to lightly brown and develop some color. The total 60 minutes ensures the cake is fully cooked and the rhubarb has softened into a jammy filling beneath the spongy cake layer.
- Let the dump cake rest for 5-10 minutes before serving—this allows it to set slightly so it holds together better when plated. Serve warm with a scoop of vanilla ice cream or a dollop of whipped cream to complement the tart rhubarb and sweet cake.
