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Rhubarb Dump Cake

Published: Jun 16, 2025 · Modified: Jun 10, 2026 by Jamie · This post may contain affiliate links · Leave a Comment

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Transform your ordinary dessert routine with this incredibly easy and mouthwatering Rhubarb Dump Cake, a rustic treat that combines tart rhubarb with sweet, buttery cake in one effortless recipe.

Rhubarb Dump Cake

This magical dessert brings together the tangy goodness of fresh rhubarb and the simplicity of a dump cake, creating a dessert that's both nostalgic and irresistible. With minimal preparation and maximum flavor, this cake is perfect for home bakers of all skill levels.

Whether you're looking for a quick summer dessert or a comforting treat to share with family, this Rhubarb Dump Cake promises to be a crowd-pleaser that will have everyone asking for seconds.

Rhubarb Dump Cake: A Rustic Dessert Delight

Imagine a dessert that practically makes itself – that's the magic of a dump cake! This classic recipe transforms simple ingredients into a luscious, bubbling masterpiece with minimal effort. The combination of tart rhubarb and sweet cake mix creates a harmonious flavor that dances on your taste buds.

Moreover, this dump cake is incredibly forgiving. Even if you're not a seasoned baker, you'll find success with this foolproof method that requires nothing more than layering ingredients and letting the oven work its magic.

Serving Suggestions:

Elevate your Rhubarb Dump Cake with these delightful pairings:

  • Vanilla bean ice cream
  • Fresh whipped cream
  • Sprinkle of powdered sugar
  • Chopped toasted nuts
  • Dollop of Greek yogurt

Pro Tips for the Perfect Rhubarb Dump Cake:

Rhubarb Selection: Choose firm, brightly colored rhubarb stalks for the best flavor and texture. Avoid stalks that are too soft or discolored.

Cutting Technique: Chop rhubarb into uniform ½-inch pieces to ensure even cooking and consistent texture throughout the cake.

Gelatin Magic: The strawberry gelatin adds both color and a subtle fruity sweetness that complements the tart rhubarb perfectly.

Butter Distribution: Drizzle melted butter evenly to help the cake mix create a delicious, crispy top layer.

Cooling Crucial: Allow the cake to cool slightly before serving to let the flavors meld and the texture set.

Rhubarb Dump Cake

Rhubarb Dump Cake Recipe Details:

  • Preparation time: 15 minutes
  • Cooking time: 45-55 minutes
  • Servings: 12
  • Equipment: 9x13-inch baking dish, measuring cups, mixing spoon

This dessert is a testament to the beauty of simple baking – transforming basic ingredients into a spectacular treat that feels both homemade and indulgent.

Ingredients:

For the Rhubarb Base:

  • 4 cups fresh rhubarb, chopped into ½-inch pieces
  • 1 cup granulated sugar
  • 1 package (3 oz) strawberry-flavored gelatin
  • ½ teaspoon ground cinnamon (optional)
  • ½ cup chopped pecans or walnuts (optional)

For the Cake Topping:

  • 1 box (15.25 oz) yellow cake mix
  • 1 cup water
  • ½ cup unsalted butter, melted

Directions:

  1. Preheat your oven to 350°F. Generously grease a 9x13-inch baking dish or spray with non-stick cooking spray to prevent sticking.
  2. Spread the freshly chopped rhubarb in an even layer across the bottom of the prepared baking dish. Ensure the rhubarb covers the entire base for consistent flavor in every bite.
  3. Sprinkle the granulated sugar evenly over the rhubarb. Follow this with an even layer of strawberry-flavored gelatin. The gelatin will create a vibrant color and add a delightful sweet-tart dimension to the dessert.
  4. Carefully distribute the dry yellow cake mix over the rhubarb and gelatin layers. Use a spoon to spread it evenly if needed. Remember, do not mix the layers – simply let them rest on top of each other.
  5. Slowly pour the water over the cake mix, attempting to cover as much of the dry mix as possible. Then, drizzle the melted butter evenly across the top. This will help create a golden, crispy crust.
  6. If using, sprinkle cinnamon and chopped nuts over the top for an extra layer of flavor and texture.
  7. Bake in the preheated oven for 45 to 55 minutes. Look for a golden-brown top and bubbling rhubarb. If the top browns too quickly, cover with aluminum foil to prevent burning.
  8. Remove from the oven and let the cake cool in the pan on a wire rack for at least 15 minutes. This resting time allows the flavors to meld and the texture to set perfectly.

Ready to Indulge!

Serve your Rhubarb Dump Cake warm or at room temperature. A scoop of vanilla ice cream or a dollop of whipped cream takes this dessert to the next level of deliciousness.

Storage Solutions:

  • Store covered at room temperature for 1-2 days
  • Refrigerate for up to 4 days
  • Reheat gently in the oven or microwave before serving
  • Can be frozen for up to 2 months (thaw in refrigerator overnight)

Whether you're hosting a summer gathering or craving a comforting dessert, this Rhubarb Dump Cake delivers simplicity and flavor in every single bite. Enjoy the magic of this easy, rustic treat that turns humble ingredients into a spectacular dessert!

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Rhubarb Dump Cake

Rhubarb Dump Cake

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This dessert is a testament to the beauty of simple baking – transforming basic ingredients into a spectacular treat that feels both homemade and indulgent.

  • Total Time: 24 minute
  • Yield: 12 1x

Ingredients

Scale

For the Rhubarb Base:

  • 4 cups fresh rhubarb, chopped into ½-inch pieces
  • 1 cup granulated sugar
  • 1 package (3 oz) strawberry-flavored gelatin
  • ½ teaspoon ground cinnamon (optional)
  • ½ cup chopped pecans or walnuts (optional)

For the Cake Topping:

  • 1 box (15.25 oz) yellow cake mix
  • 1 cup water
  • ½ cup unsalted butter, melted

Instructions

  1. Preheat your oven to 350°F. Generously grease a 9x13-inch baking dish or spray with non-stick cooking spray to prevent sticking.
  2. Spread the freshly chopped rhubarb in an even layer across the bottom of the prepared baking dish. Ensure the rhubarb covers the entire base for consistent flavor in every bite.
  3. Sprinkle the granulated sugar evenly over the rhubarb. Follow this with an even layer of strawberry-flavored gelatin. The gelatin will create a vibrant color and add a delightful sweet-tart dimension to the dessert.
  4. Carefully distribute the dry yellow cake mix over the rhubarb and gelatin layers. Use a spoon to spread it evenly if needed. Remember, do not mix the layers – simply let them rest on top of each other.
  5. Slowly pour the water over the cake mix, attempting to cover as much of the dry mix as possible. Then, drizzle the melted butter evenly across the top. This will help create a golden, crispy crust.
  6. If using, sprinkle cinnamon and chopped nuts over the top for an extra layer of flavor and texture.
  7. Bake in the preheated oven for 45 to 55 minutes. Look for a golden-brown top and bubbling rhubarb. If the top browns too quickly, cover with aluminum foil to prevent burning.
  8. Remove from the oven and let the cake cool in the pan on a wire rack for at least 15 minutes. This resting time allows the flavors to meld and the texture to set perfectly.
  • Author: Jamie
  • Prep Time: 15 minutes
  • Cook Time: 45-55 minutes

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