Best Rhubarb Dump Cake with Jello

I’ve always had a soft spot for desserts that remind me of summer gatherings. When the weather starts warming up and rhubarb appears at the farmers market, I get excited about making simple treats that everyone can enjoy. This rhubarb dump cake with jello has become one of my go-to recipes when I need something quick but still homemade.

What I love most about this recipe is how easy it is to throw together. There’s no fancy equipment needed, and you won’t end up with a counter full of dirty bowls. Just layer the ingredients, pop it in the oven, and let the magic happen. The combination of tart rhubarb and sweet jello creates such a nice balance that even my kids, who usually turn their noses up at rhubarb, ask for seconds.

Whether you’re heading to a potluck or just want to make something special for your family, this recipe hits all the right notes. And the best part? While it bakes, your kitchen fills with the most wonderful smell of summer.

What Kind of Rhubarb Should I Use?

Both fresh and frozen rhubarb work perfectly in this dump cake, so you can use whichever is easier to find. If you’re using fresh rhubarb, look for stalks that are firm and crisp, with a bright pink to red color – though keep in mind that color doesn’t affect the taste. When shopping, avoid any stalks that are limp or have brown spots. Fresh rhubarb should be trimmed of leaves (which aren’t edible) and cut into roughly 1-inch pieces. If you’re going the frozen route, there’s no need to thaw it first – just use it straight from the freezer, which helps keep the pieces distinct in your cake.

Options for Substitutions

This easy dump cake recipe is pretty forgiving and allows for several substitutions:

• Rhubarb: If rhubarb isn’t in season, you can swap it with other tart fruits like green apples, cranberries, or even a mix of strawberries and rhubarb. Just keep the total amount at 4 cups.
• Strawberry Jello: Feel free to experiment with different Jello flavors! Raspberry, cherry, or mixed berry all work great with rhubarb. Sugar-free Jello works too, just note the cake might be less sweet.
• Cake Mix: Any light-colored cake mix works here – try vanilla, butter yellow, French vanilla, or even spice cake for a different twist. Just make sure it’s around 16 ounces.
• Butter: You can use margarine instead of butter, though butter gives the best flavor. Coconut oil also works, but it might add a slight coconut taste.
• Optional Sugar: If you’re watching sugar intake, you can reduce or skip the extra sugar, especially if using sweeter Jello flavors. You can also try using a sugar substitute that’s meant for baking.

Watch Out for These Mistakes While Baking

The biggest mistake when making rhubarb dump cake is adding too much liquid – if your rhubarb is frozen, don’t thaw it first, as this will release excess moisture and make your cake soupy instead of perfectly moist. Another common error is not spreading the dry cake mix evenly over the rhubarb layer, which can result in dry, powdery patches in your finished cake – take an extra minute to ensure the mix is distributed in an even layer. To prevent a greasy top, drizzle the melted butter in a crisscross pattern rather than pouring it all in one spot, and resist the urge to stir the layers together – the magic of a dump cake happens when the ingredients stay separate during baking. For the best texture, let the cake cool for at least 15-20 minutes before serving, allowing the fruit layer to set and the top to achieve that perfect buttery-crisp finish.

What to Serve With Rhubarb Dump Cake?

This sweet and tart dessert calls for some simple but delicious accompaniments that really make it shine. A scoop of vanilla ice cream is perfect here – it melts slightly into the warm cake and creates an amazing creamy contrast to the tangy rhubarb. If you’re not in the mood for ice cream, a dollop of fresh whipped cream or even a pour of cold heavy cream works great too. For a special breakfast treat, serve it with your morning coffee or tea and maybe add a spoonful of Greek yogurt on top for a tangy-sweet start to your day.

Storage Instructions

Keep Fresh: Once your rhubarb dump cake has cooled down, cover it with plastic wrap or aluminum foil and pop it in the fridge. It’ll stay good for about 4-5 days, though I doubt it’ll last that long! The cake tends to get a bit more moist as it sits, which some folks actually prefer.

Freeze: This dump cake is perfect for freezing! Cut it into portions, wrap them individually in plastic wrap, then place in a freezer bag. It’ll keep well for up to 3 months. Just remember to label the bag with the date – it’s easy to forget when you made it!

Enjoy Later: When you’re ready to dig in, let frozen pieces thaw overnight in the fridge. If you’d like it warm, heat individual portions in the microwave for about 30 seconds. A scoop of vanilla ice cream on top of a warm piece is absolutely wonderful!

Preparation Time	10-15 minutes
Cooking Time	55-60 minutes
Total Time	65-75 minutes
Level of Difficulty	Easy

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 1400-1600
• Protein: 10-15 g
• Fat: 60-70 g
• Carbohydrates: 200-220 g

Ingredients

• 1 box yellow cake mix (I like Duncan Hines yellow cake mix)
• 1/2 cup sugar (optional, use if rhubarb is very tart)
• 1/2 cup melted butter (unsalted is preferred)
• 1 cup water
• 1 package (3 oz) strawberry gelatin
• 4 cups diced rhubarb

Step 1: Preheat the Oven and Prepare the Pan

Begin by preheating your oven to 350°F (175°C).

Take out a 9×13 inch baking pan and get ready for layering the ingredients.

Step 2: Layer the Rhubarb

Place the rhubarb in an even layer at the bottom of the pan.

If you’re using frozen rhubarb, there’s no need to thaw it completely.

Just let it thaw enough so you can break it apart and spread it out evenly in the pan.

Step 3: Add the Jello and Cake Mix

Sprinkle your choice of Jello powder over the rhubarb, distributing it evenly.

Follow this by sprinkling the dry cake mix over the Jello layer, ensuring it covers the entire surface uniformly.

Step 4: Add Butter and Water

Pour melted butter over the cake mix, trying to spread it as evenly as possible.

Then drizzle water over the top of everything to help the cake mix absorb moisture.

Step 5: Bake the Dessert

Place the pan in the preheated oven and bake for 55-60 minutes.

Look for the top to set in places and the fruit to become bubbling hot.

The dessert is ready when these signs are visible.

Step 6: Cool and Serve

Allow the dessert to cool slightly before serving.

Keep in mind, this won’t cut like a traditional cake, so be prepared to scoop it up and enjoy the delicious layers.