Old-Fashioned Rhubarb Dump Cake

Rhubarb Dessert
This vintage rhubarb dessert combines tangy fresh rhubarb with sweet marshmallows and a boxed cake mix for a nostalgic, no-fuss treat. Popular in mid-20th-century kitchens, this kind of recipe offered homemakers a way to whip up dessert with pantry staples. The result is a bubbling, soft-bottomed fruit filling with a golden, cake-like topping—perfect served warm with ice cream or whipped cream.
Prep Time 15 minutes
Cook Time 1 hour
Total Time 1 hour 15 minutes
Course Dessert
Cuisine American
Servings 10
Calories 292 kcal

Ingredients
  

  • 5 – 6 cups rhubarb (chopped )
  • ¾ cup brown sugar (packed)
  • cups miniature marshmallows (or slightly more, to taste)
  • 1 box cake mix (white or yellow, dry, not prepared)

Instructions
 

Step 1: Prepare the Pan

  • Grease a 9×13-inch baking pan lightly with butter or nonstick spray.

Step 2: Layer the Rhubarb

  • Add chopped rhubarb evenly across the bottom of the pan.

Step 3: Add Sweetness

  • Sprinkle packed brown sugar over the rhubarb.

Step 4: Add Marshmallows

  • Sprinkle miniature marshmallows over the brown sugar layer.

Step 5: Top with Cake Mix

  • Pour the dry cake mix evenly over the marshmallow layer.

Step 6: Bake

  • Bake at 350°F for 1 hour, or until the top is golden and the rhubarb is bubbly and soft

Tips

  • Add 1 to 2 cups of strawberries for a sweeter fruit blend.
  • Sprinkle coconut or chopped nuts on top of the fruit before adding the cake mix.
  • Use a butter cake mix for a richer flavor.
  • Add ½ cup melted butter drizzled over the cake mix for a crispier top.
  • Mix in orange zest for a citrus twist.
  • Substitute mini marshmallows with marshmallow fluff if needed.
  • Add cinnamon or nutmeg to the rhubarb for warm spice notes.
  • Serve warm with vanilla ice cream or whipped cream.
  • For a tarter dessert, reduce the brown sugar.
  • For a softer texture, cover the pan with foil for the first 30 minutes of baking.

Nutrition

Calories: 292kcalCarbohydrates: 67gProtein: 3gFat: 2gSaturated Fat: 1gPolyunsaturated Fat: 0.3gMonounsaturated Fat: 0.5gTrans Fat: 0.2gSodium: 371mgPotassium: 230mgFiber: 2gSugar: 43gVitamin A: 62IUVitamin C: 5mgCalcium: 180mgIron: 1mg
Keyword dump cake, easy baking, potluck dessert, retro dessert, rhubarb, vintage recipes
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