This slow cooker 3-ingredient blue lagoon dump cake is the kind of low-effort dessert that feels made for busy summer weekends, especially when you need something fun and colorful for a cookout or pool party without turning on the oven. It has that classic dump cake ease—just layer, cover, and let the slow cooker do the work—while the bright blue citrus filling gives it a playful twist that always gets people talking when you set it out.
Serve this warm or at room temperature with a scoop of vanilla ice cream or whipped topping to balance the sweet citrus flavor. If you’re bringing it to a summer gathering, it pairs especially well with grilled burgers, hot dogs, barbecue chicken, fresh fruit, and icy lemonade, and the bright color makes it a natural fit for poolside dessert tables.
Slow Cooker 3-Ingredient Blue Lagoon Dump Cake
Servings: 8
Ingredients
1 box yellow cake mix
1 can blue citrus or blue-colored pie filling, about 21 ounces
1/2 cup unsalted butter, melted
Directions
1. Lightly coat the inside of a 4- to 6-quart slow cooker with nonstick spray or a thin layer of butter.
2. Spread the blue pie filling evenly across the bottom of the slow cooker.
3. Sprinkle the dry yellow cake mix evenly over the filling, covering the surface as completely as possible without stirring.
4. Drizzle the melted butter over the top as evenly as you can, making sure to moisten most of the cake mix.
5. Cover and cook on high for 2 to 2 1/2 hours or on low for 4 hours, until the filling is hot and bubbly and the top is set with golden buttery crumbles.
6. Turn off the slow cooker and let the dump cake rest uncovered for 15 to 20 minutes before scooping and serving.
Variations & Tips
Add a creamy topping: A scoop of vanilla ice cream or a big spoonful of whipped topping makes this dessert feel a little more balanced and gives the bright citrus filling a cool, creamy contrast.
Make it more citrusy: If you want the flavor to lean even more refreshing, add a little finely grated lemon or lime zest over the top right before serving. It wakes up the sweetness without adding extra work.
Watch for dry spots: Dump cakes do best when most of the cake mix gets touched by butter. If you peek near the end of cooking and see obvious dry powdery patches, drizzle on another tablespoon or two of melted butter.
Use parchment for easier cleanup: If your slow cooker runs hot or tends to brown around the edges, a parchment slow cooker liner can help keep the dessert from sticking and make cleanup much easier after a party.
Serve for summer fun: For a pool-party look, spoon the cake into clear cups so the blue filling shows through. It’s an easy way to make a super simple dessert feel festive and portable.