3-Ingredient Lemon Dump Cake
When you need a sunny dessert and you don’t want to drag out a mixer, this lemon dump cake saves the night. It’s a buttery, bright slice that comes together with just three pantry ingredients and almost no effort.
The top gets golden and crackly, while the filling stays soft and lemony underneath. Serve it warm with a scoop of vanilla ice cream for the kind of casual dessert that feels like a treat but asks very little of you.
Why This One Stays in the Rotation
The layers sort themselves in the oven. You just scatter everything into a dish, and the butter melts down to create a tender, sugary crust while the lemon filling bubbles up through the cake mix. The result is part cobbler, part bar cookie, and completely impossible to mess up.
It’s the dessert I turn to when I need something fast and uncomplicated that still tastes like I planned ahead. The tangy lemon cuts through the richness, so each bite stays bright, not cloying.
Ingredients
- 1 box (15.25 oz) yellow cake mix: any standard box mix; avoid the “pudding in the mix” variety if you can.
- 1 can (21 oz) lemon pie filling: found near the canned fruit or pie fillings.
- 1/2 cup (1 stick) unsalted butter, sliced thin: cold butter works best for a crisp top.
Variations / Substitutions
- Lemon curd: Swap the pie filling for a thick lemon curd. The end result will be a little richer and more intense.
- Gluten-free: Use a 1-to-1 gluten-free yellow cake mix.
- Blueberry lemon: Scatter a handful of fresh blueberries over the filling before the cake mix.
- Extra zest: Sprinkle 1 teaspoon lemon zest over the top before baking for a punchier lemon flavor.
If you like this one, try our strawberry dump cake for another three-ingredient wonder.
How to Make Lemon Dump Cake
Step 1: Layer the Filling and Cake Mix
Preheat your oven to 350°F (175°C). Spread the whole can of lemon pie filling evenly across the bottom of a 9×13 inch baking dish. Sprinkle the dry cake mix over the top, then gently shake the dish to level it out. Do not stir. You want two distinct layers at this point.
The filling should be a solid, even layer, and the cake mix a fine blanket that covers every bit of lemon beneath it.
Step 2: Dot with Butter
Cut the 1/2 cup of cold butter into thin slices. Arrange them over the cake mix, covering as much surface as you can. You’ll see bare patches of dry mix, that’s okay. The butter will spread as it melts.
A cold stick of butter slices cleaner, so pull it straight from the fridge before you start.
Step 3: Bake and Serve
Bake for 40 to 45 minutes, until the top is deeply golden and the filling bubbles thickly around the edges. Let the dish cool on a rack for at least 10 minutes. The filling will set up a bit as it rests.
Scoop into bowls while the cake is still warm. A spoonful of vanilla ice cream on top melts right into the lemony cracks, and that’s the moment this dessert really shines.
Tips for a Crackly Top and Bright Filling
- If the top isn’t golden enough after the bake time, switch the oven to broil for 1 to 2 minutes. Watch it the whole time, it goes from golden to burnt fast.
- For a nutty crunch, scatter a handful of chopped pecans or sliced almonds over the cake mix before you add the butter.
- If your lemon filling is very sweet, a tiny pinch of flaky salt on top right after baking cuts through the sugar beautifully.
- Make it a day ahead and reheat individual portions in the microwave for 30 seconds. The top stays crisp and the lemon flavor deepens overnight.
Bake time depends on the dish size:
| Dish Size | Bake Time |
|---|---|
| 9×13 inch | 40-45 mins |
| 8×8 inch | 50-55 mins |
Storing Leftovers
- Refrigerate: Cover tightly and store in the fridge for up to 4 days.
- Reheating: Warm individual portions in the microwave for 30 seconds, or reheat the whole dish in a 300°F oven for 10 to 15 minutes to crisp the top again.
Frequently Asked Questions
Can I use a different fruit filling?
Absolutely. Cherry, blueberry, or apple pie filling all work with the same method. Just keep the amount at 21 ounces so the ratios stay right.
Do I need to grease the baking dish?
You don’t have to. The butter and filling create a slippery layer that keeps things from sticking. A quick spritz of nonstick spray never hurts if you want extra insurance.
Why did some of the cake mix stay dry and powdery?
The butter likely wasn’t sliced thin enough or didn’t cover the whole surface. Next time, cut the butter as thinly as possible and aim to cover every bit of dry mix.
Can I use melted butter instead of sliced?
Yes, you can pour melted butter over the top. The crust will be softer and more cobbler-like. Sliced cold butter gives you that classic crackly, golden top.
Lemon Dump Cake Recipe
Ingredients
Method
- Preheat oven to 350°F (175°C). Spread lemon pie filling evenly in a 9×13 inch baking dish. Sprinkle cake mix on top in an even layer. Do not stir.
- Arrange the butter slices over the cake mix, covering as much surface as possible.
- Bake 40 to 45 minutes until golden and bubbly. Cool 10 minutes, then scoop and serve warm.
