This slow cooker 3-ingredient lemon blueberry dump cake is the kind of bright spring dessert that makes people stop mid-bite and ask for the recipe. My mother-in-law did exactly that the first time I brought it over for Sunday dinner—she couldn’t believe something this perfectly sweet, tart, and cozy came from just three pantry-friendly ingredients and a slow cooker. It’s a busy-week lifesaver: no mixing bowls, no fancy steps, just dump, sprinkle, drizzle, and let the slow cooker work its magic while you tackle the rest of your day.
Serve this lemon blueberry dump cake warm, straight from the slow cooker, with a big spoon so everyone can scoop into the bubbling purple blueberry filling and golden, buttery cake crumbles. It’s especially good topped with a scoop of vanilla ice cream or a dollop of whipped cream to balance the tart lemon. For a lighter option, pair it with plain Greek yogurt. I like to set it out for casual gatherings with coffee or hot tea—its bright flavors also make it a fun dessert after grilled chicken, salads, or any simple spring or summer meal.
Slow Cooker 3-Ingredient Lemon Blueberry Dump CakeServings: 8
Ingredients
2 cans (21 ounces each) blueberry pie filling
1 box (15.25 ounces) lemon cake mix (dry mix only)
1/2 cup (1 stick) unsalted butter, melted
Directions
Lightly grease the inside of a 4- to 6-quart slow cooker with nonstick cooking spray or a thin layer of butter to help prevent sticking.
Spread the blueberry pie filling evenly over the bottom of the slow cooker, making sure it reaches all the way to the edges so every scoop gets plenty of fruit.
Sprinkle the dry lemon cake mix evenly over the blueberry pie filling. Do not stir. You want a dry, even layer of cake mix covering the berries so it bakes into crumbles and soft cake pockets.
Slowly drizzle the melted butter evenly over the entire surface of the dry cake mix, trying to moisten as much of the mix as possible. It’s okay if a few dry spots remain; they’ll still bake up into a buttery crumble texture.
Cover the slow cooker with the lid and cook on HIGH for 2 to 2 1/2 hours, or on LOW for 4 hours, until the top is mostly set, the edges are golden, and the blueberry filling is bubbling up around the sides. The surface should look like soft, moist cake with some buttery crumbles, not like a solid, dry sheet cake.
Turn off the slow cooker and let the dump cake sit, covered, for 10 to 15 minutes to set slightly. This helps the filling thicken and makes it easier to scoop while still staying warm and gooey.
Serve the lemon blueberry dump cake warm, scooped straight from the slow cooker into bowls. Top with vanilla ice cream, whipped cream, or enjoy as is. Store any leftovers covered in the fridge for up to 3 days, and reheat gently in the microwave or on LOW in the slow cooker.
Variations & Tips
For extra lemon flavor, you can stir 1 to 2 teaspoons of finely grated lemon zest into the blueberry pie filling before adding the cake mix (this technically adds an ingredient, but it’s a fun upgrade when you’re not strictly counting). If you only have butter-flavor yellow cake mix, you can use that and add a tablespoon of bottled lemon juice over the blueberries to keep things bright and tart. To keep prep even easier on a workday, measure and melt the butter ahead of time and store it in a small container in the fridge; just re-melt briefly in the microwave before drizzling. You can also assemble the blueberry layer and dry cake mix in the slow cooker insert the night before (without the butter), cover, and refrigerate—then in the morning, drizzle on the melted butter and start the cooker. For a slightly crisper top, prop the lid open with a wooden spoon during the last 20 to 30 minutes of cooking to let some steam escape. If you’re serving a smaller crowd, you can halve the recipe in a 3-quart slow cooker and reduce the cook time a bit, checking early so it doesn’t overcook around the edges.
