My mother-in-law relies on this 3 part wonder for every Sunday gathering. It takes exactly 2 minutes of prep to get that perfect bubbling crust.

 

This 3-ingredient lemon dump cake is the exact kind of “3 part wonder” my mother-in-law leans on for every Sunday gathering. It truly takes about 2 minutes of hands-on prep: you just dump, sprinkle, drizzle, and pop it in the oven. The result is a bubbling lemon filling with a golden, slightly crisp crust on top—comforting, a little old-fashioned, and perfect for feeding a crowd without fuss. It’s the kind of recipe that gets passed around at potlucks because it’s so simple and always disappears fast.

Serve this lemon dump cake warm, scooped straight from the ceramic baking dish so everyone can see that golden, bubbly top. A scoop of vanilla ice cream or a dollop of whipped cream softens the tart lemon and makes it feel extra special. It pairs nicely with simple dishes like roasted chicken, grilled brats, or a big Sunday ham, plus a fresh green salad. For coffee time, serve small scoops in bowls with hot coffee or iced tea on the side.

3-Ingredient Lemon Dump Cake

Servings: 8-10

Ingredients

2 cans (21 ounces each) lemon pie filling

1 box (15.25 ounces) white cake mix (dry, unprepared)

1 cup (2 sticks) unsalted butter, melted

Directions

Preheat your oven to 350°F (175°C). Set a 9x13-inch ceramic baking dish on the counter; no need to grease it heavily—just a light swipe of butter or spray if you like easy cleanup.

Dump the lemon pie filling into the ceramic baking dish and spread it into an even layer, making sure it reaches all the corners. This is your tangy, bubbly base.

Sprinkle the dry white cake mix evenly over the lemon pie filling. Try to cover the filling completely with a light, even layer so you don’t end up with dry patches of mix after baking.

Slowly drizzle the melted butter evenly over the entire surface of the dry cake mix, paying extra attention to the corners and edges. You want most of the mix touched by butter so it bakes into a golden, slightly crisp crust.

Place the baking dish on the middle rack of the preheated oven and bake for 35–45 minutes, or until the top is golden brown, the edges look a little crisp, and you can see the lemon filling bubbling up around the sides.

Remove from the oven and let the dump cake rest for at least 10–15 minutes. This helps the filling thicken slightly while still staying warm and gooey underneath that crunchy, buttery top.

Spoon into bowls while warm and serve as-is, or top with vanilla ice cream or whipped cream. Store any leftovers covered in the fridge and rewarm gently in the oven or microwave before serving.

Variations & Tips

For a lighter lemon flavor, mix 1–2 tablespoons of water into the dry cake mix before sprinkling to soften the topping a bit and make it more cobbler-like instead of super crisp. If you have citrus fans, grate a little lemon zest over the pie filling before adding the cake mix to boost the brightness. For kids or picky eaters who like things sweeter, sprinkle 2–3 tablespoons of granulated sugar over the cake mix before drizzling on the butter, or finish the cooled cake with a light dusting of powdered sugar. You can also add 1 cup of fresh or frozen blueberries on top of the lemon pie filling for a lemon-blueberry version—no need to thaw the berries, just scatter and bake as directed. To make smaller portions, divide everything between two smaller ceramic baking dishes; bake time may be a few minutes shorter, so keep an eye on the color of the crust. If you only have salted butter, use it and skip any extra salt—many families actually prefer that little salty edge against the tart lemon. For a slightly richer topping, use 3/4 cup melted butter and dot the top with a few thin slices of butter before baking to encourage extra golden spots and crisp edges.