Classic Blueberry Dump Cake

Looking for a dessert that’s ridiculously easy but tastes like you spent hours in the kitchen? We all need those recipes that don’t require a million steps or fancy techniques, especially when you’re short on time but still want something homemade and delicious.

That’s exactly why this blueberry dump cake is about to become your new favorite go-to dessert. It literally takes minutes to throw together—just dump the ingredients in a pan, pop it in the oven, and you’re done. No mixing bowls, no complicated instructions, just simple layers that bake up into a warm, buttery treat that everyone will love.

What Kind of Blueberries Should I Use?

The great thing about dump cake is that you can use either fresh or frozen blueberries, and both work perfectly. If you’re using frozen blueberries, don’t bother thawing them first – just toss them straight into your baking dish from the freezer. Fresh blueberries are wonderful when they’re in season, but frozen ones are actually ideal for this recipe since they release their juices slowly as they bake, creating that signature gooey filling. Just make sure to pick through your fresh berries and remove any stems or mushy ones before using them.

Options for Substitutions

This dump cake is super forgiving when it comes to swapping ingredients:

• Blueberries: Feel free to use other berries like raspberries, blackberries, or a mixed berry blend. You can also try sliced peaches or cherries for a completely different flavor profile. Just keep the amount at 4 cups.
• Lemon cake mix: Yellow cake mix or white cake mix work great here. If you switch to a different flavor, consider adjusting the zest accordingly – orange zest pairs nicely with yellow cake mix.
• Lemon zest: No fresh lemon? You can skip the zest or use ½ teaspoon of lemon extract instead. Orange zest is another tasty option that complements blueberries well.
• Unsalted butter: Salted butter works fine – just reduce or omit any additional salt in the recipe. You can also use coconut oil for a dairy-free version, though it will add a slight coconut flavor.
• Granulated sugar: If your berries are already sweet, you can reduce the sugar to ¼ cup. For a different sweetness, try brown sugar which adds a hint of caramel flavor.

Watch Out for These Mistakes While Baking

The biggest mistake people make with dump cakes is not covering the cake mix completely with butter, which leaves dry pockets of powder that won’t bake properly – make sure to drizzle the melted butter evenly across the entire surface, even if you need an extra tablespoon or two.

Another common error is using a pan that’s too large, which spreads the filling too thin and can lead to burning around the edges, so stick with a 9×13-inch baking dish for the best results.

Don’t skip the cooling time after baking, as the filling will be extremely hot and liquidy straight from the oven – those 10-15 minutes allow it to thicken up and make serving much easier.

If you’re using frozen blueberries, resist the urge to thaw them first since the extra moisture can make your cake mix gummy instead of creating that signature crispy, cobbler-like topping.

What to Serve With Blueberry Dump Cake?

This blueberry dump cake is pretty much perfect on its own, but a big scoop of vanilla ice cream on top takes it to the next level – the cold ice cream melting into the warm cake is absolutely delicious. If you want something a bit lighter, try serving it with fresh whipped cream or even a dollop of Greek yogurt for breakfast (yes, cake for breakfast!). I also love pairing it with a hot cup of coffee or tea, especially when you’re serving it to guests for a casual dessert. For a fancier presentation, add some fresh blueberries and a sprig of mint on top right before serving.

Storage Instructions

Store: Keep any leftover blueberry dump cake covered with foil or plastic wrap right in the baking dish. It’ll stay fresh in the fridge for about 4 days. The topping might soften a bit over time, but it still tastes great!

Freeze: This cake freezes really well for up to 3 months. Let it cool completely, then wrap individual portions tightly in plastic wrap and place in a freezer-safe container. You can also freeze the whole thing if you prefer.

Reheat: Warm up individual servings in the microwave for about 30-45 seconds, or reheat larger portions in a 350°F oven for 15-20 minutes until warmed through. If you want to crisp up the top again, pop it under the broiler for just a minute or two while watching carefully.

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 3200-3400
• Protein: 22-26 g
• Fat: 85-95 g
• Carbohydrates: 610-640 g

Ingredients

For the fruit base:

• 4 cups blueberries (fresh or frozen)
• 2/3 cup sugar (C&H cane sugar preferred)
• 1 lemon zest
• 1 1/2 tsp vanilla extract
• 1/4 tsp salt

For the topping:

• 15.25 oz lemon cake mix (Duncan Hines)
• 12 tbsp butter (melted and cooled)

Step 1: Prepare the Pan and Oven

Preheat your oven to 350°F.

While it heats, grease a 9×13 inch baking dish (or similar size) with butter or cooking spray, making sure to coat the bottom and sides evenly.

This prevents the cake from sticking and ensures even browning on the edges.

Step 2: Create the Blueberry Base

• 4 cups blueberries
• 2/3 cup sugar
• 1 lemon zest
• 1 1/2 tsp vanilla extract
• 1/4 tsp salt

In the prepared baking dish, combine the blueberries, sugar, lemon zest, vanilla extract, and salt.

Stir gently until the berries are evenly coated with the sugar mixture—this helps the blueberries release their juices and creates a jammy filling.

I like to taste a berry at this point to make sure the sweetness is balanced; if your blueberries are very tart, you can add an extra tablespoon of sugar.

Step 3: Layer the Cake Mix and Butter

• 15.25 oz lemon cake mix
• 12 tbsp butter

Sprinkle the dry lemon cake mix evenly over the blueberry mixture, covering it completely but don’t stir—you want the cake mix to stay on top.

Then pour the melted and cooled butter evenly over the cake mix layer.

I find it easiest to pour the butter in a thin stream back and forth across the pan to ensure it distributes evenly and reaches all the dry mix.

Step 4: Bake Until Golden

Place the baking dish in the preheated oven and bake for 1 hour, or until the top is golden brown and a toothpick inserted into the cake portion comes out clean or with just a few moist crumbs.

The blueberries will bubble up around the edges slightly—this is exactly what you want and signals that the filling is cooked through.

Step 5: Cool and Serve

Remove the cake from the oven and let it cool for 10-15 minutes on a wire rack or trivet.

This allows the filling to set slightly while the cake stays warm and tender.

The cake will continue to firm up as it cools, making it easier to serve.

Scoop into bowls and serve warm with vanilla ice cream or whipped cream if desired.

Classic Blueberry Dump Cake

Delicious Classic Blueberry Dump Cake recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 25 minutes mins

Cook Time 55 minutes mins

Total Time 1 hour hr 20 minutes mins

Servings: 12 servings

Calories: 3300

Ingredients Method

Ingredients

  

For the fruit base:

• 4 cups blueberries (fresh or frozen)
• 2/3 cup sugar (C&H cane sugar preferred)
• 1 lemon zest
• 1 1/2 tsp vanilla extract
• 1/4 tsp salt

For the topping:

• 15.25 oz lemon cake mix (Duncan Hines)
• 12 tbsp butter (melted and cooled)

Method

 

1. Preheat your oven to 350°F. While it heats, grease a 9x13 inch baking dish (or similar size) with butter or cooking spray, making sure to coat the bottom and sides evenly. This prevents the cake from sticking and ensures even browning on the edges.
2. In the prepared baking dish, combine the blueberries, sugar, lemon zest, vanilla extract, and salt. Stir gently until the berries are evenly coated with the sugar mixture—this helps the blueberries release their juices and creates a jammy filling. I like to taste a berry at this point to make sure the sweetness is balanced; if your blueberries are very tart, you can add an extra tablespoon of sugar.
3. Sprinkle the dry lemon cake mix evenly over the blueberry mixture, covering it completely but don't stir—you want the cake mix to stay on top. Then pour the melted and cooled butter evenly over the cake mix layer. I find it easiest to pour the butter in a thin stream back and forth across the pan to ensure it distributes evenly and reaches all the dry mix.
4. Place the baking dish in the preheated oven and bake for 1 hour, or until the top is golden brown and a toothpick inserted into the cake portion comes out clean or with just a few moist crumbs. The blueberries will bubble up around the edges slightly—this is exactly what you want and signals that the filling is cooked through.
5. Remove the cake from the oven and let it cool for 10-15 minutes on a wire rack or trivet. This allows the filling to set slightly while the cake stays warm and tender. The cake will continue to firm up as it cools, making it easier to serve. Scoop into bowls and serve warm with vanilla ice cream or whipped cream if desired.