Blueberry Dump Crumble Cake | Easy Cast Iron Dessert Recipe

If you’ve got a box of yellow cake mix and a jar of blueberry pie filling, you’re about five minutes away from becoming a backyard dessert hero. Big Poppa’s Blueberry Dump Crumble Cake is the lazy dessert that absolutely steals the show — buttery, gooey, golden, and dangerously easy.

This cast iron dump cake layers sweet blueberry filling, crumbly cake mix crust, and a brown sugar cinnamon crumble that bakes into a crisp top with soft blueberry goodness underneath. No fancy mixing bowls. No drama. Just dump, bake, and try not to eat it straight from the skillet.

Poppa’s Game Plan

This is what I call “high reward, low effort.” We build a buttery cake base right in a cast iron skillet, top it with a brown sugar crumble, bake until golden, then hit it with blueberry pie filling and ice cream. It’s backyard BBQ afterparty dessert done right.

What You’ll Need

Main Ingredients

• 1 box yellow cake mix
• 1 stick unsalted butter, melted
• 1 jar blueberry pie filling

Crumble Topping

• 1 cup brown sugar
• 1/2 cup flour
• 1 tsp cinnamon
• 1 tsp vanilla extract

Optional

• Vanilla ice cream (highly recommended)

Step-by-Step: Blueberry Dump Crumble Cake

1) Preheat

Preheat oven to 350°F.

2) Build the Base

In a cast iron skillet, combine yellow cake mix and melted butter. Stir until crumbly, then press evenly into the bottom to form the base.

3) Make the Crumble

In a separate bowl, mix brown sugar, flour, cinnamon, and vanilla until crumbly.

4) Layer It Up

Spread the crumble evenly over the cake base. Bake for 25–30 minutes until golden brown and crisp on top.

5) Finish & Serve

Let cool for 10–15 minutes. Spoon blueberry pie filling over each serving and top with vanilla ice cream. Serve warm and brace yourself for repeat requests.

Shop Rubs & Sauces

FAQ

Can I use a different fruit filling?

Absolutely. Cherry, peach, apple — this method works with all of them.

Do I have to use cast iron?

No, but it gives you great crust and even heat. A baking dish works too.

Can I make this ahead of time?

Yes. Reheat at 300°F for 10–15 minutes before serving.

How should I store leftovers?

Cover and refrigerate up to 3–4 days. Reheat gently before serving.