Easy Key Lime Dump Cake Recipe With Simple Ingredients
This easy Key Lime Dump Cake is creamy, sweet, buttery, and packed with fresh lime flavor in every bite. The rich citrus filling and soft golden cake topping come together to make one of the easiest desserts you can bake at home.
If you love simple desserts that taste bright and refreshing, this easy key lime dessert is perfect. It uses basic ingredients, takes very little prep work, and bakes into a soft and creamy cake that is great for holidays, family dinners, potlucks, and summer parties.
This key lime dump cake recipe is also great for beginner bakers because there is no complicated mixing or decorating. Just layer the ingredients, bake, and enjoy a delicious homemade dessert.
Why You Will Love This Key Lime Dump Cake Recipe
- Easy to make with simple pantry ingredients
- Full of bright and creamy lime flavor
- Soft buttery cake topping with rich filling
- Perfect for spring and summer desserts
- Great make-ahead dessert for parties
- No mixer needed
- Easy to customize with fun toppings
- Delicious served warm or chilled
- Family-friendly dessert recipe
- Perfect for lime lovers
Ingredients for Key Lime Dump Cake
- 1 box yellow cake mix
- 8 oz cream cheese, softened
- 1 can sweetened condensed milk (14 oz)
- 1 cup key lime juice
- 1 tsp lime zest
- 1/2 cup unsalted butter, melted
- 1 tub whipped topping (8 oz)
- 1/2 cup graham cracker crumbs
Ingredient Notes and Substitutions
Yellow Cake Mix
Yellow cake mix gives this dessert a rich buttery flavor that works perfectly with the tart lime filling. White cake mix or vanilla cake mix can also be used if needed.
Key Lime Juice
Fresh key lime juice gives the best bright citrus flavor. Bottled key lime juice works well too. Regular lime juice may be used if key limes are not available.
Cream Cheese
Softened cream cheese creates a smooth and creamy filling. Make sure it is fully softened before mixing so the filling stays silky and lump free.
Sweetened Condensed Milk
Sweetened condensed milk adds sweetness and helps create the rich creamy texture in the filling. Do not replace it with evaporated milk because the texture will not be the same.
Melted Butter
The melted butter helps create the golden buttery topping on the cake mix layer. Try to drizzle it evenly across the surface for the best texture.
Graham Cracker Crumbs
Graham cracker crumbs add a flavor similar to classic key lime pie. They also give a little crunch on top of the creamy dessert.
How to Make Key Lime Dump Cake
Prepare the Oven and Baking Dish
Preheat the oven to 350 degrees F. Lightly grease a 9×13-inch baking dish with butter or nonstick spray. This helps prevent sticking and makes serving easier later.
Set the baking dish aside while preparing the filling.
Mix the Cream Cheese Until Smooth
Place the softened cream cheese into a large mixing bowl. Stir well using a spatula or hand mixer until smooth and creamy. Make sure there are no large lumps left in the cream cheese.
This step helps create a rich and silky filling texture.
Add the Sweetened Condensed Milk
Pour the sweetened condensed milk into the bowl with the cream cheese. Stir slowly until fully combined and smooth.
The mixture should look creamy and thick with a pale color.
Mix in the Key Lime Juice and Lime Zest
Add the key lime juice and fresh lime zest to the bowl. Stir everything together until the filling becomes smooth and creamy.
The filling will slightly thicken as the lime juice mixes with the condensed milk. The fresh lime zest adds extra citrus flavor and makes the dessert taste brighter.
Spread the Lime Filling Into the Baking Dish
Pour the creamy key lime filling into the prepared baking dish. Use a spatula to spread it evenly across the bottom.
Make sure the filling reaches all the corners so every bite has plenty of creamy lime flavor.
Sprinkle the Dry Cake Mix on Top
Open the yellow cake mix and sprinkle the dry mix evenly across the lime filling layer.
Do not stir the layers together. The dry cake mix should stay on top because it forms the buttery cake topping while baking.
Try to spread the cake mix as evenly as possible so the topping bakes evenly.
Drizzle the Melted Butter Over the Cake Mix
Slowly drizzle the melted butter over the dry cake mix layer. Try to cover most of the dry spots with butter.
Some small dry patches are normal and help create texture in the topping. The butter melts into the cake mix while baking and creates a soft golden crust.
Bake the Key Lime Dump Cake
Place the baking dish into the preheated oven and bake for 40 to 45 minutes.
The top should look golden brown with bubbly edges when finished baking. The filling underneath will still be soft and creamy.
If the top starts browning too quickly, loosely cover the dish with foil during the last few minutes of baking.
Let the Cake Cool Before Serving
Remove the cake from the oven and let it cool for at least 20 minutes before serving.
The filling thickens more as it cools. Top with whipped topping, graham cracker crumbs, and extra lime zest before serving if desired.
Serve warm, room temperature, or chilled from the refrigerator.
Tips for the Best Key Lime Dump Cake
- Use fully softened cream cheese for a smoother filling.
- Fresh lime zest gives stronger citrus flavor.
- Do not mix the cake mix into the filling layer.
- Spread the butter evenly across the top.
- Let the cake cool before slicing for cleaner servings.
- Chill leftovers for an extra creamy texture.
- Use a glass or ceramic baking dish for even baking.
- Add extra whipped topping before serving for a lighter dessert.
Easy Variations and Add-Ins
Coconut Key Lime Dump Cake
Add 1 cup shredded coconut before baking for a tropical flavor.
White Chocolate Lime Dessert
Sprinkle white chocolate chips over the lime filling before adding the cake mix.
Graham Cracker Crust Style
Add crushed graham crackers to the bottom of the baking dish before pouring in the filling.
Berry Lime Dump Cake
Add fresh raspberries or strawberries to the filling layer for fruity flavor.
Lemon Lime Version
Use half lemon juice and half lime juice for a mixed citrus dessert.
What to Serve With Key Lime Dump Cake
- Vanilla ice cream
- Fresh whipped cream
- Fresh berries
- Iced tea
- Lemonade
- Coconut whipped topping
- Lime slices
- Hot coffee
- Fresh fruit salad
Key Lime Dump Cake
Ingredients
Method
- Preheat the oven to 350 degrees F. Grease a 9×13-inch baking dish lightly with butter or nonstick cooking spray. Set aside.
- Place the softened cream cheese into a large mixing bowl. Stir until smooth and creamy with no large lumps remaining.
- Add the sweetened condensed milk to the cream cheese. Mix well until fully combined and smooth.
- Pour in the key lime juice and add the lime zest. Stir until the mixture becomes creamy and slightly thickened.
- Pour the key lime filling into the prepared baking dish. Spread evenly using a spatula so the filling reaches all corners of the dish.
- Sprinkle the dry yellow cake mix evenly over the lime filling layer. Do not stir the layers together.
- Slowly drizzle the melted butter over the top of the dry cake mix. Try to cover as much of the cake mix as possible for even baking.
- Place the baking dish into the oven and bake for 40 to 45 minutes or until the top is golden brown and the edges are bubbly.
- Remove the cake from the oven and let it cool for at least 20 minutes before serving. The filling will continue to set as it cools.
- Top with whipped topping, graham cracker crumbs, and extra lime zest before serving if desired.
Notes
- Fresh key lime juice gives the best flavor, but bottled juice also works well.
- Do not mix the cake mix into the filling layer.
- Some dry cake mix spots on top are normal.
- Store leftovers covered in the refrigerator for up to 4 days.
- This dessert tastes even creamier after chilling overnight.
- Serve chilled for a texture similar to key lime pie.
- Add extra whipped topping and lime zest for a bakery-style presentation.
This easy Key Lime Dump Cake recipe is creamy, bright, sweet, and packed with refreshing citrus flavor. The buttery cake topping and smooth lime filling create the perfect balance in every bite. It is one of the easiest desserts to make with simple ingredients and almost no prep work.
Whether you need a quick summer dessert, an easy party recipe, or a simple family treat, this easy key lime dump cake is always a delicious choice.
