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This blueberry poke cake is cool, creamy, and filled with blueberry flavor in every bite. It starts with a boxed white cake mix, gets topped with whipped topping and buttery graham cracker crumbs, and chills into an easy make-ahead dessert. You’re going to love how simple it is.
Why You’ll Love It
- Easy shortcut — starts with a boxed cake mix for simple prep
- Blueberry in every bite — blended pie filling soaks into the warm cake
- Make-ahead friendly — chilling gives the layers time to settle together
- Cool and light — a great finish after a cookout or heavier dinner
- Crowd-sized — makes a 13-by-9 pan with about 15 servings
Ingredient Notes
Use an 18.25-ounce white cake mix, prepared according to the directions on its box. White cake is what I prefer here because it lets the blueberry color show off a little. Yellow cake works too, if that is what you have staring at you from the pantry. I’ve used both. I said I prefer white, but I’m not going to the store for it if yellow is already in my cabinet. Absolutely not.
The blueberry pie filling is canned, and we’re going to blend it until smooth. That may sound a little odd if you have always used pie filling straight from the can, but blending it makes it pour into those holes so much better. A regular blender does the job. I have not tried to make my ancient blender look cute—it is avocado green and sounds like a lawn mower—but it has been chugging along.
For the whipped topping, use an 8-ounce tub that has been thawed. You can make homemade whipped cream, I suppose, and I’m sure it would be delicious, but then you’re adding another bowl and another step. Some days I have the energy. Some days I do not, and that’s the truth.
The topping is just butter, brown sugar, and crushed graham crackers. Nothing complicated. I like regular honey graham crackers. Cinnamon grahams work too, though I’m a little stubborn about blueberry and plain graham being the right combination.
Ingredients
- 1 box (18.25 ounces) white cake mix, prepared according to the package instructions
- 1 can (21 ounces) blueberry pie filling
- 1 container (8 ounces) whipped topping, thawed
- 2 tablespoons butter
- 3 tablespoons brown sugar
- 3 graham crackers, crushed—not pulverized into dust, just crushed up nicely
- Additional fresh blueberries, if you’d like them for serving
Instructions
Prepare the white cake mix according to the package directions and bake it in a 13-by-9-inch pan. The baking time will depend on your particular mix, so follow the box for that part. I know, I know—recipe writers are supposed to tell you every last thing, but cake mix companies have that information right there in print, and I trust them on this one.
Once the cake comes out of the oven, let it sit just long enough that you can safely handle the pan without performing a small burn-related drama. You want the cake warm when you poke it, not completely cooled. Use a wooden skewer or the round end of a wooden spoon to make holes all over the top. I aim for holes about an inch apart—roughly seven or eight down and five or six across, give or take. This is not geometry class. Just make plenty of little blueberry highways.
Put the blueberry pie filling in a blender and blend it until it is liquified and smooth. The first time I did this, I was convinced it would turn into purple soup and ruin everything. It did look a little alarming, I’ll admit. But that smooth filling is exactly what you want because it can sink down into the warm cake instead of sitting on top in clumps.
Pour the blended blueberry filling over the warm cake. Use a spoon to gently spread it around and coax it into the holes. Don’t rush this part. You don’t need to mash the cake to bits, but do give the filling a little encouragement. I have skipped the spoon before because I was in a hurry, and the result was still edible—obviously—but not nearly as blueberry all the way through.
Spread the thawed whipped topping evenly over the blueberry layer. The blueberry filling may still be a little warm, but it should not be piping hot. If it is steaming like a sidewalk in August, wait a few minutes. Otherwise the whipped topping gets sad and slippery, and then you’ll be standing there with a spatula trying to negotiate with it. No thank you.
Melt the butter, then stir it together with the brown sugar and crushed graham crackers. Sprinkle that buttery graham mixture over the whipped topping. Try to get it fairly even, although there will always be one corner with more crumbs. That is the cook’s corner, as far as I’m concerned.
Refrigerate the cake for at least 4 hours before serving. This is important. The chilling time is when the filling settles into the cake and the whole thing becomes that creamy, soft, blueberry situation you were hoping for. If you cut it early, it will still taste good, but it won’t be quite as settled. Patience is irritating, but occasionally useful.
Serve with a few additional blueberries on top, if you want. Or don’t. Sometimes I remember them, sometimes I find the container two days later behind the mustard. Such is life.
Variations
For a lemon blueberry poke cake, use a boxed lemon cake mix instead of white cake mix. After the blueberry filling and whipped topping go on, skip the graham cracker topping and finish the cake with lemon zest and fresh blueberries. That version is especially pretty, and it has a brighter, tangier little edge to it.
You can also use another berry pie filling if blueberry isn’t your family’s favorite. Cherry works beautifully, and I’ve heard from more than one person who likes it just as much. I made a strawberry version once with a different topping situation, and it was good, though blueberry remains my favorite here. There is something about blueberry with the graham crackers that tastes like late summer, when the Tomatoes are going wild and you start noticing it gets dark a little earlier. Not that I’m ready for that. I never am.
I did try adding a heavier layer of graham cracker crumbs one time, thinking more topping would be better. It was not. It turned into a sandy little blanket on top, and nobody complained because my family will eat dessert under nearly any conditions, but I noticed. Three crackers is enough. Resist your urge to “improve” it, says the woman who has learned this lesson perhaps forty times.
Storage & Reheating
Cover the cake tightly and keep it in the refrigerator. It will hold nicely for a few days, though the graham cracker topping does soften more as it sits. I happen to like that softer, buttery texture, but if you know you are making the cake well ahead and want the topping crispier, you could keep the graham cracker mixture separate and sprinkle it over individual servings.
There is no reheating here, naturally. Please don’t microwave whipped topping. I feel like I shouldn’t have to say that, but somebody out there has considered it, and I respect your curiosity while strongly discouraging the experiment.
This cake is actually very nice cold straight from the fridge the next day.
Final Notes
This is not a towering layer cake. It does not require a cake turntable, a piping bag, or an afternoon of pretending you enjoy washing mixing bowls. It is just a soft white cake, blueberry filling worked into every little hole, cool whipped topping, and a sweet crumbly finish.
But it has a way of making an ordinary dinner feel a little more like summer. The kind of summer evening where the screen door keeps slapping shut, somebody leaves a bike in the driveway, and you find yourself standing in the kitchen after everyone has gone home—or gone upstairs, which is basically the same thing with teenagers—having one more small bite from the corner of the pan.
Not a proper slice. Just a taste.
Then maybe another taste, because there is hardly any point putting that last little bit away, and tomorrow will come soon enough…
Blueberry Poke Cake
Ingredients
- 1 box white cake mix 18.25 ounces, prepared according to the package instructions
- 1 can blueberry pie filling 21 ounces
- 1 container whipped topping 8 ounces, thawed
- 2 tablespoons butter
- 3 tablespoons brown sugar
- 3 graham crackers crushed, not pulverized
- fresh blueberries optional, for serving
Instructions
- Prepare the white cake mix according to the package directions and bake it in a 13-by-9-inch pan, following the baking time listed on the box for your mix.
- Once the cake comes out of the oven, let it sit just long enough to safely handle the pan, then use a wooden skewer or the round end of a wooden spoon to make holes all over the warm cake about 1 inch apart.
- Put the blueberry pie filling in a blender and blend until liquified and smooth so it can sink into the holes instead of sitting on top in clumps.
- Pour the blended blueberry filling over the warm cake and use a spoon to gently spread it around and coax it into the holes without mashing the cake.
- Spread the thawed whipped topping evenly over the blueberry layer, waiting a few minutes first if the filling is still piping hot.
- Melt the butter, then stir it together with the brown sugar and crushed graham crackers.
- Sprinkle the buttery graham cracker mixture evenly over the whipped topping.
- Refrigerate the cake for at least 4 hours before serving so the filling settles into the cake and the layers become cool and creamy.
- Serve cold with additional fresh blueberries on top, if desired.