Blackberry Lemon Dump Cake (Easy Dessert Recipe!)

Our mouthwatering Blackberry Lemon Dump Cake combines the juicy sweetness of blackberries with the tangy zest of lemons, creating a harmonious blend that will leave your taste buds craving more. And the best part? It requires minimal effort to make!

My family has a sweet tooth that almost never seems to be satisfied! Whether we’re going to a potluck, having friends or family over impromptu, or just want an easy dessert to satisfy that sweet tooth, I’m a huge fan of dump cakes.

They’re super simple to make with minimal ingredients and require almost no time or effort!

What makes this dessert truly special is its effortless preparation. Just toss the ingredients together and let your oven work its magic. The result? A mouthwatering treat with a golden, crumbly crust that perfectly balances the tartness of blackberries with the refreshing citrus notes of lemon.

What is a dump cake?

It is just what it sounds like…..open the ingredients, dump them in a pan, and bake. Ok, there may be just a couple of additional steps, but it will literally only take a fraction of the time it takes to make a cake from scratch. Classic dump cake is one of the easiest cakes to make, and it’s an easy recipe that you can change up any way you want to!

So when your sweet tooth kicks in or you need whip up a quick dessert for a party or gathering, turn to this Blackberry Lemon Dump Cake as an effortless last-minute solution.

If you love fruit-infused desserts, try these gems:

• Lemon Blueberry Cookies
• Cranberry Orange Pound Cake
• Summer Berry Cream Cake

Ingredients Needed For Blackberry Lemon Dump Cake Recipe

Dump cake recipes call for a short list of simple ingredients, which is why they are one of the easiest desserts to make! Here’s what you’ll need for this easy lemon dump cake recipe. 

• Lemon Cake Mix – any brand you prefer
• Rolled Oats – old fashioned oats are the same thing
• Fresh Blackberries – frozen will work but fresh is best
• Sugar – granulated sugar
• Cinnamon
• Butter Sticks
• Ice Cream – vanilla or your favorite

NOTE: For more recipe details, please check out the handy printable recipe card at the bottom of the post!

How to Make Blackberry Lemon Dump Cake

This easy dump cake recipe comes together in just a few steps to create a delicious dessert that your friends and family will request again and again!

Step 1 – Preheat Oven

Preheat the oven to 350 degrees, and prepare baking pan with nonstick spray.

Step 2 – Make Berry Mixture

Mix together the blackberries, sugar and cinnamon in a bowl. Spread mixture on the bottom of the baking pan.

Step 3 – Layer Cake Ingredients

Sprinkle half of the rolled oats on the berry mixture. Then add the box of cake mix on top of rolled oats. Finally add the remaining half of the rolled oats on the layer of cake mix.

Step 4 – Add Butter On top

Next, top with melted or thin pats of butter evenly over the top of the rolled oats.

Step 5 – Bake

Bake in your preheated oven for 30 minutes or until bubbly and the top is golden brown.

Serve with a scoop of vanilla ice cream or homemade whipped cream, if desired, and ENJOY your easy peasy blackberry lemon dump cake dessert!

Blackberry Lemon Dump Cake Recipe Notes And Tips

• Evenly distribute the butter slices (or shaved, cold butter) on top of the oatmeal. This will ensure that the butter goodness melts over every delectable inch of the cake and moistens the oats and cake mix.

• If you use frozen blackberries or other fruit, I recommend shaking the fruit in a bit of cornstarch before adding it to the dish. This will help the fruit from sinking to the bottom of the dough or batter.

• My preference when making the Blackberry Lemon Dump Cake is to use a glass baking dish, but I also like to make this dish in a large cast iron skillet. Works beautifully!

• Put the butter stick in the freezer before you shave it. Trust me, it will make it much easier and quicker to put on the top of the dump cake.

Variations To Try

• There are so many flavor variations of this tasty treat that you can try. Here are a few other suggestions for you to whip up:
  • Strawberry dump cake – combine strawberries with white or yellow cake mix
  • Blueberry lemon dump cake – combine blueberries with lemon or white cake mix
  • Cherry dump cake – combine cherries with chocolate or vanilla cake mix

• Sprinkle with chopped pecans or walnuts for a yummy earthy, flavor!

• Add some brown sugar on the top before baking. You will love the little extra sweetness, caramel flavor, and crunch.

• Add a little lemon zest on top of the cake mix for a little added zest!

• Lemon lovers will appreciate adding lemon pie filling. I recommend folding the berries into the filling before adding it to the pan.

Make It Gluten-Free

To make this recipe gluten-free, just use a gluten-free cake mix and check that your rolled oats are gluten-free.

SAFETY NOTE: Oats are naturally gluten-free, but are often packaged in a facility that processes items with wheat, barley, or rye – the cross-contamination makes them not safe for people who need to eat gluten-free.

Blackberry Lemon Dump Cake Storage

How long will the Blackberry Lemon Dump Cake leftovers stay fresh?

If you have any leftover lemon dump cake, you can refrigerate it in an airtight container for up to 5 days.

Can I make this Blackberry Lemon Dump Cake ahead of time?

Yes! You can prepare it up to 2 – 3 days in advance. Keep it in the fridge until ready to serve. I recommend making it as close to the time that you wish to serve it – or the day before.

Can I freeze this dump cake?

I have never done that with this specific recipe, but I don’t see any reason why you couldn’t freeze it. To thaw, let it sit out on the counter at room temperature for several hours or overnight.

To serve, I recommend putting it in the oven at 350 degrees for 20-30 minutes to heat it all the way through and make sure it’s not soggy from being frozen.

More Easy Dessert Recipes To Try

• Easy Fresh Homemade Strawberry Cobbler
• Dark Chocolate Raspberry Cupcakes
• Apple Pie Bites (Cinnamon Roll Apple Pie Cups)
• Homemade No Churn Raspberry Ice Cream
• Creamy Instant Pot Fresh Berry Cheesecake

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