Easy 3-Ingredient Lazy Rhubarb Dump Cake
A quick and simple dessert made with just rhubarb, yellow cake mix, and melted butter, perfect for last-minute cravings and casual gatherings.
- Prep Time: 10 minutes
- Cook Time: 40-45 minutes
- Total Time: 50-55 minutes
- Yield: 8 servings 1x
- Category: Dessert
- Cuisine: American
Ingredients
Scale
- 4 cups fresh rhubarb, chopped into 1-inch pieces (or 1 can/12 ounces canned rhubarb or rhubarb preserves)
- 1 box (15.25 ounces) yellow cake mix
- 1 cup (2 sticks, 226 grams) unsalted butter, melted
- Optional: pinch of cinnamon
- Optional: 1/2 cup granulated sugar (for sweeter rhubarb)
Instructions
- Preheat oven to 350°F (175°C).
- If using fresh rhubarb, wash and chop into 1-inch pieces. Toss with 1 tablespoon sugar if desired.
- Spread rhubarb evenly in the bottom of a greased 9×13 inch baking dish.
- Sprinkle dry yellow cake mix evenly over the rhubarb without stirring.
- Pour melted butter slowly over the cake mix, covering as much surface as possible.
- Bake for 40-45 minutes until the top is golden brown and bubbling around the edges.
- Remove from oven and let cool for about 15 minutes to set.
- Serve warm, optionally with vanilla ice cream or whipped cream.
Notes
Do not stir the cake mix into the rhubarb to avoid a dense, soggy texture. Pour melted butter slowly and evenly. Let the cake rest after baking to thicken the filling. If the cake is too runny, bake a few extra minutes uncovered. Use real unsalted butter for best flavor and texture. For dairy-free, substitute butter with coconut oil or vegan margarine. For gluten-free, use a gluten-free yellow cake mix.
Nutrition
- Serving Size: 1/8th of the cake
- Calories: 275
- Sugar: 20
- Sodium: 250
- Fat: 14
- Saturated Fat: 8
- Carbohydrates: 35
- Fiber: 2
- Protein: 2
Keywords: rhubarb dump cake, easy dessert, 3-ingredient cake, quick rhubarb dessert, lazy cake recipe