Step 1: Prepare the Slow Cooker
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Lightly grease a 4- to 6-quart slow cooker with cooking spray or a thin coating of butter to prevent sticking.
Step 2: Add the Blueberries
Spread the frozen blueberries evenly across the bottom of the slow cooker.
There’s no need to thaw them first—using frozen berries helps create a rich, juicy filling.
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Step 3: Sweeten the Fruit
Sprinkle the granulated sugar evenly over the blueberries to help create a thick, syrupy filling as the dessert cooks.
Step 4: Add the Cake Mix
Evenly distribute the dry lemon cake mix over the berries.
Avoid stirring. Keeping the layers separate creates the signature cobbler-like texture.
Step 5: Add the Butter
Slowly drizzle the melted butter over the entire surface of the cake mix, covering as much as possible.
Some dry patches are perfectly normal and will become lightly crisp during cooking.
Step 6: Slow Cook
Cover with the lid and cook:
- HIGH: 2 to 2½ hours
- LOW: 3½ to 4 hours
The dessert is ready when the blueberries are bubbling around the edges and the topping appears mostly set.
Step 7: Let It Rest
Turn off the slow cooker and allow the dump cake to rest for 10 to 15 minutes before serving.
This helps the filling thicken slightly for easier scooping.
Serving Suggestions
Serve warm with one of these delicious toppings:
- Vanilla ice cream
- Fresh whipped cream
- Vanilla Greek yogurt
- Heavy cream
- Lemon whipped topping
For brunch, top with vanilla yogurt and a sprinkle of granola for a sweet breakfast-inspired treat.
Helpful Tips
- Always use frozen blueberries for the best texture.
- Do not stir the ingredients after layering.
- Wild blueberries create a richer filling, but regular frozen blueberries work just as well.
- For extra citrus flavor, add 1 teaspoon of fresh lemon zest to the cake mix before sprinkling it over the berries.
- If using salted butter, simply omit any additional salt.
Easy Variations
Mixed Berry Version
Replace one cup of blueberries with frozen raspberries, blackberries, or strawberries.
Peach Blueberry Dump Cake
Combine three cups of blueberries with one cup of frozen peach slices for a fruity twist.
Less Sweet Option
Reduce the sugar to ¼–⅓ cup if you prefer a more balanced dessert.
Crunchy Topping
Sprinkle chopped pecans or sliced almonds over the butter before cooking for added texture.
Storage
Allow the dump cake to cool completely before transferring it to an airtight container.
- Refrigerator: Store for up to 3 days.
- Freezer: Freeze individual portions for up to 2 months.
Reheat in the microwave or warm gently in the slow cooker before serving.
Frequently Asked Questions
Can I use fresh blueberries?
Yes. Fresh blueberries work well, although the filling may be slightly less juicy than when using frozen berries.
Do I have to thaw frozen blueberries?
No. Adding them frozen helps create the ideal consistency.
Why shouldn’t I stir the layers?
Keeping the ingredients layered allows the cake mix to form a buttery topping while the fruit cooks underneath.
Can I bake this instead?
Yes. Assemble the ingredients in a greased 9×13-inch baking dish and bake at 350°F (175°C) for 45–55 minutes, or until bubbly and golden.
Final Thoughts
This Slow Cooker Lemon Blueberry Dump Cake proves that incredible desserts don’t have to be complicated. With just four everyday ingredients and a slow cooker doing most of the work, you’ll have a warm, comforting dessert that’s perfect for any occasion. Whether topped with vanilla ice cream, whipped cream, or yogurt, every spoonful delivers the perfect combination of juicy blueberries and buttery lemon cake.
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