Easy Apple Rhubarb Dump Cake (Only 4 Ingredients!)
This Apple Rhubarb Dump Cake is the easiest dessert you'll ever make. Just layer tart rhubarb, sweet apples, and cake mix for a golden, bubbling treat that tastes like it took all day.
The Easiest Rhubarb Dessert You Will Ever Make
If you have ever stood in front of a pile of fresh rhubarb wondering what on earth to do with it, this Apple Rhubarb Dump Cake is your answer. It is one of those 4 ingredient recipes for dessert that sounds almost too simple to be good, yet somehow delivers a bubbling, golden, fruit-filled masterpiece every single time. Tart rhubarb, sweet canned apple, a box of cake mix, and butter. That is genuinely all it takes.
This is the kind of recipe that belongs in your back pocket for potlucks, lazy Sunday afternoons, or any time someone asks you to bring dessert and you said yes before thinking it through. Warm from the oven with a scoop of vanilla ice cream melting into the crust, it is pure comfort food.
Why This Combination Works So Well
Rhubarb on its own is bracingly tart, almost candy-like in its sourness. That is exactly what makes rhubarb candy flavors so intriguing to bakers. When you pair it with the mellow sweetness of apple pie filling, the two balance each other out perfectly. The apple softens the sharp edges of the rhubarb while the rhubarb keeps the whole thing from tasting cloying or one-note.
This is also one of the best recipes using frozen rhubarb, since you do not need to thaw it. If you stocked up during peak season and have bags tucked in your freezer, this dump cake was basically made for you.
Chef's Tip: If your rhubarb is especially thin and tender, fresh stalks will melt into the filling beautifully. If it is thicker and more fibrous, chop it a little smaller so every bite is tender after baking.
Having the right baking dish makes a real difference here. A heavy ceramic or glass 9x13 dish distributes heat evenly and helps the bottom layer cook through without the topping over-browning.
Tips for the Best Apple Rhubarb Cake
This falls squarely into the world of dump cake recipes made easy, but a few small details separate a great one from a mediocre one.
- Cover every inch with butter. Thin, evenly spaced butter pats are what turn the dry cake mix into a crispy, golden crust. Gaps in the butter mean chalky, powdery patches on top. Do not rush this step.
- Do not stir. This is a layered cake. Resist every instinct to mix the layers together.
- Watch for the bubble. The cake is done when you can see the fruit bubbling up around the edges and the top is a deep amber-gold. A pale top usually means it needs more time.
- Let it rest. Ten minutes out of the oven allows the filling to thicken slightly so it scoops cleanly rather than running all over the plate.
This recipe is also a wonderful base for variations. It works just as well as a rhubarb cake with cake mix approach when you swap in spice cake mix for a warmer, cinnamon-forward flavor. White cake mix keeps things light and delicate. The structure stays exactly the same.
A Note on Canned Rhubarb
If fresh and frozen rhubarb are both out of reach, canned rhubarb recipes are absolutely a valid path. Drain the canned rhubarb well before using it, since the packing liquid can make the bottom layer too wet. You may also want to reduce the added sugar slightly since canned rhubarb is often packed in a light syrup.
Ready to dive in? Here is everything you need laid out step by step.
Easy Apple Rhubarb Dump Cake (Only 4 Ingredients!)
This Apple Rhubarb Dump Cake is the easiest dessert you'll ever make. Just layer tart rhubarb, sweet apples, and cake mix for a golden, bubbling treat that tastes like it took all day.
Ingredients
- 4 cups rhubarb, fresh or frozen, chopped into 1-inch pieces
- 21 oz apple pie filling, 1 standard can
- 15 1/4 oz yellow cake mix, one standard box, dry and unprepared
- 1/2 cups unsalted butter, sliced into thin pats
- 1/2 cups granulated sugar, to sweeten the rhubarb layer
Instruction
Preheat your oven to 350 degrees F (175 degrees C). Lightly grease a 9x13-inch baking dish with butter or nonstick spray.
Spread the chopped rhubarb evenly across the bottom of the prepared baking dish. Sprinkle the granulated sugar over the rhubarb and toss gently to coat.
Spoon the canned apple pie filling evenly over the sugared rhubarb layer, spreading it all the way to the edges.
Open the dry cake mix and pour it straight from the box over the apple layer. Spread it into an even layer with a spoon or your hands, making sure to cover the fruit completely.
Lay the thin butter pats evenly across the top of the dry cake mix, covering as much surface area as possible. The more coverage, the crispier and more golden the top will be.
Bake uncovered for 45 to 55 minutes, until the top is deep golden brown, the edges are bubbling, and no dry cake mix patches remain visible.
Let the cake rest for at least 10 minutes before serving. Serve warm with a scoop of vanilla ice cream or a dollop of whipped cream.
Equipment
- 9x13-inch baking dish
- Sharp knife and cutting board
- Measuring cups
- Spoon or spatula for spreading
Notes
Serving and Storing Your Dump Cake
Serve this warm, ideally with a generous scoop of vanilla ice cream or softly whipped cream. The contrast of cold cream against the hot, bubbly filling is genuinely one of life's small pleasures.
Leftovers keep in the refrigerator for up to 4 days. The topping softens overnight, but the flavor deepens and improves. For a crispier texture on day two, reheat portions in a low oven rather than the microwave. This cake also freezes well in an airtight container for up to 2 months.
