This Blueberry Lemon Dump Cake is a foolproof dessert that comes together with just 6 ingredients and barely 10 minutes of hands-on work. Juicy blueberries meet bright citrus in every bite, all crowned with a gloriously golden, buttery crust — baked right in one pan. Pile a scoop of ice cream on top and watch it disappear.
Table of Contents
Why You Will Love This Blueberry Lemon Dump Cake
- Only 6 pantry-friendly ingredients stand between you and dessert.
- Everything goes into one baking dish — fewer dishes, zero drama.
- Pairs beautifully with a generous scoop of vanilla ice cream or a tangy No-Churn Lemon Ice Cream.
- From counter to oven in under 10 minutes.
- The flavor is genuinely outstanding — sweet, citrusy, and rich all at once.
So… What Even Is a Dump Cake?
The name sounds a little rough around the edges, but hear me out — this is actually one of the most satisfying things you can bake. A dump cake sits somewhere between a traditional cake and a cobbler, and it earns its quirky name honestly: you literally dump everything into a pan and bake it.
No creaming butter. No whisking eggs. No layering pans. Just ingredients going in, heat doing its thing, and something genuinely magical coming out of the oven. The real trick happens when thin slices of butter melt down through the dry cake mix during baking, forming a rich, crackly, almost crumble-like crust over the bubbling fruit below. It tastes like you spent hours on it. You didn’t.
Ingredients & Smart Swaps
- Blueberries — Fresh is my top pick here, but frozen works too. If going frozen, thaw them fully and drain off any extra liquid so the base doesn’t turn watery. Feel free to swap in raspberries, blackberries, or a mixed berry combo.
- Sugar — Just enough to coax out the natural sweetness of the berries. Adjust to taste, or swap in your preferred granulated sweetener.
- Cornstarch — This is what gives the blueberry layer that jammy, cohesive texture instead of a watery puddle.
- Lemon zest — Here’s the move: add it to both the berries and the cake mix. It makes the lemon flavor feel woven into the whole dessert rather than an afterthought. A lemon-flavored cake mix is fine, but fresh zest is on another level entirely.
- Yellow cake mix — Betty Crocker Super Moist Yellow is my go-to. Just a heads up — box sizes have been quietly shrinking (13.25 oz. now instead of 15.25). It still bakes up beautifully. Gluten-free cake mix works here too if needed.
- Unsalted butter — Slice it thin and lay it evenly across the top. Unsalted gives you control over the overall saltiness.
How to Make It
Step 1: Preheat your oven to 350°F. Lightly grease a 9×13 baking pan. Add the blueberries, sugar, cornstarch, and 1 tablespoon of lemon zest directly into the pan. Toss it all together right there — no extra bowl needed.
Step 2: Spread the blueberry mixture into an even layer across the bottom of the pan.
Step 3: Pour the dry cake mix evenly over the blueberries, making sure to cover them completely. Scatter the remaining tablespoon of lemon zest over the cake mix, then gently press or work it in with your fingers or a spoon so it distributes into the layer.
Step 4: Cut the butter into thin slices — roughly ¼ inch thick — and lay them across the entire surface of the cake mix. Try to leave minimal gaps so the butter coverage is as even as possible.
Step 5: Bake for 45–55 minutes until the top is golden brown and the blueberry filling is visibly bubbling up around the edges. Let it cool for a few minutes before serving, then top generously with vanilla ice cream.
Recipe Tips Worth Knowing
- Use your baking dish as your mixing bowl. Toss the blueberries with sugar, cornstarch, and zest right in the pan. One less thing to wash.
- Don’t panic about butter gaps. If you notice any bare spots mid-bake, just tuck a small piece of butter in. It melts fast and catches up quickly.
- Want a taller, thicker dump cake? Use a smaller dish — a deep casserole works well. Just plan to add 5–10 minutes to the bake time.
- Bake it to your preferred shade of golden. Pull it early for a lighter, softer top, or leave it in a little longer for a deep amber crust with more crunch. I always go the extra minute or two — the darker finish is worth it.
Storage
Leftovers keep well in an airtight container in the refrigerator for 4 to 5 days. Enjoy it cold straight from the fridge, or warm it up in the microwave for 30–60 seconds before serving.
To freeze, let the cake cool completely first. Cover tightly with plastic wrap or foil, then seal in a freezer-safe container. It holds up well in the freezer for up to 3 months. Thaw overnight in the refrigerator before reheating.
Frequently Asked Questions
Can I make this dump cake ahead of time?
Yes! You can bake it a day in advance and store it covered in the refrigerator. Warm individual portions in the microwave or reheat the whole pan in a 300°F oven for about 15 minutes before serving.
Do I need to mix the cake mix with anything before adding it?
Nope — that’s the whole beauty of a dump cake. The dry cake mix goes straight in, and the butter melts into it during baking to create that signature crumbly topping.
My blueberry layer looks watery. What went wrong?
This usually happens when frozen berries aren’t drained well enough or when the cornstarch wasn’t fully incorporated into the berry layer. Make sure to toss the cornstarch thoroughly with the berries before spreading.
Can I use a different flavor of cake mix?
Absolutely. Lemon cake mix is a natural fit and amps up the citrus flavor. White cake mix also works well and keeps things light. Avoid chocolate or strongly spiced mixes — they’ll clash with the blueberries.
Why isn’t my topping browning evenly?
Uneven butter coverage is the most common culprit. If spots look pale or powdery while others are browning, add small butter pieces to the bare areas and continue baking. Rotating the pan halfway through can also help.
Is there a dairy-free version of this?
Yes — plant-based butter (like a vegan stick variety) works well as a 1:1 swap. Just make sure it’s the solid stick kind, not a spreadable tub, for best results.
Can I double this recipe?
You can! Use two 9×13 pans rather than one larger pan to keep the baking time consistent. Stacking ingredients too deep in a single dish can result in an undercooked bottom layer.
Easy Blueberry Lemon Dump Cake
Ingredients
- 4 cups fresh blueberries or frozen, thawed and drained
- ¼ cup granulated sugar adjust to taste
- 2 tbsp cornstarch
- 2 tbsp lemon zest divided — 1 tbsp for berries, 1 tbsp for topping
- 1 box yellow cake mix 13.25 oz, such as Betty Crocker Super Moist
- ½ cup unsalted butter (1 stick), sliced into ¼-inch pieces
Instructions
- Step 1 — Preheat & Prep the Pan Preheat your oven to 350°F (175°C). Lightly grease a 9×13 baking pan with butter or non-stick spray.Step 2 — Build the Blueberry Base Add the blueberries, granulated sugar, cornstarch, and 1 tablespoon of lemon zest directly into the prepared pan. Toss everything together until the berries are evenly coated, then spread the mixture into an even layer across the bottom.Step 3 — Add the Cake Mix Layer Pour the dry cake mix evenly over the blueberry layer, making sure to cover it completely from edge to edge. Sprinkle the remaining 1 tablespoon of lemon zest over the top of the cake mix, then gently work it in using your fingers or a spoon.Step 4 — Top with Butter Slice the butter into thin pieces, about ¼ inch thick, and arrange them in a single layer across the entire surface of the cake mix. Try to keep the pieces close together so the coverage is as even as possible.Step 5 — Bake Place the pan in the preheated oven and bake for 45–55 minutes, until the top is deep golden brown and the blueberry filling is bubbling up around the edges. Remove from the oven and allow to cool for 5–10 minutes before serving.Step 6 — Serve the scoop into bowls and top with a generous scoop of vanilla ice cream. Serve warm and enjoy!
Notes
- Berry swap: Raspberries, blackberries, or a mixed berry blend all work beautifully in place of or alongside the blueberries.
- Butter gaps: If you notice any dry, powdery spots of cake mix mid-bake, simply tuck in a small extra piece of butter and continue baking.
- Thicker cake: For a deeper, thicker dessert, use a smaller baking dish such as a 2.5–3 quart casserole dish and add 5–10 minutes to the bake time.
- Doneness preference: Pull the cake out early if you prefer a lighter, softer topping, or leave it in a few extra minutes for a deeper, crunchier golden crust.
- Storage: Store leftovers covered in the refrigerator for up to 4–5 days. Freeze for up to 3 months — wrap tightly in plastic wrap or foil before freezing. Thaw overnight in the fridge before reheating.
- Gluten-free option: Substitute a gluten-free yellow cake mix using a 1:1 ratio.
Nutrition
Calories: 294kcal, Carbohydrates: 53g, Protein: 2g, Fat: 9g, Saturated Fat: 6g, Cholesterol: 20mg, Sodium: 382mg, Potassium: 53mg, Fiber: 2g, Sugar: 34g, Vitamin A: 260IU, Vitamin C: 4mg, Calcium: 96mg, Iron: 1mg Nutrition information is automatically calculated and should only be used as an approximation.Shop this Post
Glass 9×13 inch Baking Dish
Zester
Pyrex Measuring Cup
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