Key Lime Poke Cake is a cool, citrusy dessert with soft vanilla cake soaked with a creamy key lime filling, then covered with a light whipped topping. Every little hole in the cake catches some of that sweet-tart filling, so the lime flavor runs through the cake instead of sitting only on top.
This is especially good when you want something refreshing for spring or summer. I’d make it for Easter, a cookout, potluck, birthday, or any warm-weather gathering where a chilled cake sounds better than something rich and heavy.
The combination of sweet vanilla cake and tart key lime keeps this dessert from feeling overly sugary. Sweetened condensed milk makes the filling creamy, while fresh lime juice provides the brightness.
It’s also a great make-ahead cake. Once the filling has soaked in, the cake needs refrigerator time anyway, so you can have dessert completely finished before guests arrive.
And there’s no decorating skill required. A relaxed layer of whipped topping and a little lime zest are plenty.
Poke cakes are also wonderfully unfussy. You bake everything in a regular 9×13-inch pan, poke holes across the surface, pour over the filling, and let the refrigerator do the rest.
In fact, this cake is better when it has time to chill. Making it several hours ahead means the filling can settle into the cake and you won’t be rushing dessert at the last minute.
Ingredients You’ll Need
You’ll need a few easy ingredients for the cake, lime filling, and topping:
- White cake mix
- Eggs
- Vegetable oil
- Water
- Sweetened condensed milk
- Key lime juice
- Key lime zest
- Whipped topping
How To Make Key Lime Poke Cake
Step 1: Preheat the oven to 350°F and lightly grease a 9×13-inch baking dish. Prepare the white cake batter with the eggs, oil, and water according to the package directions.
Step 2: Pour the batter into the prepared dish and bake until the cake is lightly golden and a toothpick inserted near the center comes out clean. Let it cool for about 10–15 minutes.
Step 3: While the cake is still slightly warm, use the handle of a wooden spoon to poke holes across the entire surface. Space them about an inch apart and make sure the holes go most of the way through the cake without reaching completely through the bottom.
Step 4: Whisk the sweetened condensed milk, key lime juice, and finely grated zest together until smooth. The mixture will begin to thicken slightly as the citrus juice combines with the condensed milk.
Step 5: Slowly pour the key lime mixture over the cake, concentrating some of it directly over the holes. Use a spatula to gently spread the filling across the surface so it can work its way down into the cake.
Step 6: Let the cake cool completely, then cover and refrigerate for at least 3–4 hours. This chilling time gives the filling a chance to soak in and allows the cake to become properly cold.
Step 7: Spread the whipped topping evenly over the chilled cake. Add a little fresh lime zest over the surface if you’d like a simple finish.
Step 8: Keep the cake refrigerated until serving, then cut it into squares and serve cold.
Key Lime Poke Cake Variations
Graham Cracker Key Lime Cake
Sprinkle crushed graham crackers over the whipped topping shortly before serving for a nod to classic key lime pie.
Coconut Key Lime Cake
Add toasted shredded coconut over the top for a tropical variation.
Extra-Lime Poke Cake
Increase the fresh lime zest rather than adding lots of additional juice, which could make the cake too wet.
Lemon Lime Poke Cake
Replace part of the key lime juice with fresh lemon juice for a softer mixed-citrus flavor.
Key Lime Cupcakes
Bake the cake batter as cupcakes, poke several holes in each one, and spoon a smaller amount of filling over the tops before chilling.
Storing Key Lime Poke Cake
Keep Key Lime Poke Cake covered in the refrigerator because of the creamy filling and whipped topping. It’s best enjoyed within about 3–4 days.
I wouldn’t leave it sitting at room temperature for more than two hours. For the nicest texture, take individual pieces from the refrigerator only when you’re ready to serve them.
What To Serve With Key Lime Poke Cake
Key Lime Poke Cake is already cool, creamy, and fairly sweet, so I usually serve it straight from the refrigerator without adding much else. Fresh strawberries or raspberries are nice alongside a slice, and iced tea or hot coffee both work surprisingly well with the tart lime flavor. For a summer cookout or potluck, I’d cut it into modest squares and serve it alongside fresh fruit and a few simple cookies rather than another heavy dessert. A little graham cracker crumble on top is also nice if you want to bring in some of that familiar key lime pie flavor.
Do I Have To Use Key Limes?
No. Regular Persian limes work if key limes aren’t available. Key limes have a slightly more floral, distinctive flavor, but either will give you a bright citrus cake.
Can I Use Bottled Key Lime Juice?
Yes. Bottled key lime juice is convenient and works well in desserts. If possible, use fresh lime zest alongside it for a fresher aroma.
Why Isn’t The Filling Going Into The Holes?
The holes may be too small. The handle of a wooden spoon works better than a fork because it creates openings large enough for the creamy filling to settle into.
Can I Make Key Lime Poke Cake Ahead?
Absolutely. This is one of those desserts that benefits from being made ahead. Prepare it the day before and keep it covered in the refrigerator.
How Long Does The Cake Need To Chill?
Give it at least 3–4 hours. Overnight is even better when you want the cake thoroughly chilled and the lime filling well distributed.
Why Is My Cake Soggy?
Too much liquid or pouring the filling onto an underbaked cake can make it overly wet. Use the measured filling and make sure the cake itself is completely baked first.
Make the holes while the cake is still slightly warm, but give it plenty of refrigerator time after adding the filling. That’s what gives you moist pockets of lime throughout without the cake falling apart.
And don’t underestimate the zest. The juice provides the tartness, but fresh lime zest is what gives Key Lime Poke Cake that unmistakably fresh citrus aroma.
Key Lime Poke Cake
Ingredients
- 1 15.25-ounce box white cake mix
- 3 large eggs
- ½ cup vegetable oil
- 1 cup water
- 1 14-ounce can sweetened condensed milk
- ½ cup key lime juice
- 1 tablespoon finely grated key lime zest
- 1 8-ounce container whipped topping, thawed
Instructions
- Preheat the oven to 350°F and grease a 9×13-inch baking dish.
- Prepare the cake mix with the eggs, vegetable oil, and water.
- Pour into the prepared dish and bake for 25–30 minutes, or until a toothpick inserted near the center comes out clean.
- Cool for 10–15 minutes, then poke holes about 1 inch apart across the cake using the handle of a wooden spoon.
- Whisk together the sweetened condensed milk, key lime juice, and lime zest.
- Slowly pour the lime mixture over the cake, spreading it evenly and encouraging it into the holes.
- Cool completely, then cover and refrigerate for at least 3–4 hours.
- Spread the whipped topping over the chilled cake and garnish with additional lime zest if desired.
- Keep refrigerated until ready to slice and serve.
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