Blueberry Lemon Icebox Cake

Cool, creamy, bright, and bursting with juicy blueberries, this make-ahead blueberry lemon icebox cake is the kind of no-bake dessert that disappears fast at summer gatherings. Layers of soft graham crackers, lemony whipped cream filling, and flavorful blueberry sauce chill together into a sliceable cake with a light, mousse-like texture. Best of all? You only need 9 simple ingredients.

I originally published this recipe in 2017, and I’ve since updated it with new photos, additional success tips, and added cream cheese to the whipped cream filling.

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This make-ahead dessert is perfect for warm-weather entertaining, from BBQs and pool parties to baby showers, birthdays, or as a Memorial Day recipe, or Fourth of July dessert. Because it’s served cold, it’s especially welcome on hot summer days.

If you love the classic lemon + blueberry flavor combination, this easy icebox cake delivers all the sunshine-sweet flavor without turning on the oven. 🙂

Why You’ll Love This Blueberry Lemon Icebox Cake

• Completely no-bake
• Made with just 9 ingredients
• Easy to prepare ahead of time
• Tastes like lemon blueberry cheesecake meets fluffy cake
• Soft, mousse-like texture after chilling
• Easy-to-slice loaf

Cool, light, and refreshing, icebox cakes come together in a matter of minutes with only a handful of ingredients.

Unlike traditional layer cakes, icebox cakes transform in the refrigerator or freezer. The graham crackers soften into tender cake-like layers while the whipped cream and blueberry fillings meld together into one dreamy dessert. It sounds unusual at first, but one bite and you’ll understand why icebox cakes have such a loyal following!

One reader, Edie, commented: “Light and summery! This recipe is another winner. It is EXTREMELY easy to make with just a few simple ingredients. ★★★★★”

Another reader, Carissa, commented: “This was DELICIOUS!! Like literally lick the plate yummy. And so easy to make, but looks fancy and complex… I used mixed berries for the sauce, since that’s all I had, which worked great. And no kidding the graham crackers got so fantastic in texture, almost like a cake. This will be a new summer go-to! ★★★★★”

Another reader, PB, commented: “I made this with my 6- and 9-year-old boys. It was easy and they enjoyed doing most of the work. We used ginger snap cookies and it was out of this world. Such a wonderful summer dessert, so light. ★★★★★”

You Need Just 9 Ingredients

1. Fresh Lemons: You need both the juice and zest to flavor both the blueberry sauce and the cream filling, so everything tastes bright and vibrant. Be sure to zest the lemons before juicing.
2. Cornstarch: Key for thickening the blueberry sauce. Dissolve it in some lemon juice and a little warm water before adding it to the berries. This is called making a “cornstarch slurry” and prevents it from clumping in the sauce.
3. Blueberries: Fresh or frozen blueberries both work well. Frozen berries are especially convenient because they’re available year round, and you don’t even need to thaw them first.
4. Granulated Sugar: Just a couple Tablespoons to sweeten the blueberry sauce.
5. Heavy Cream: The bulk of the filling.
6. Cream Cheese: This thickens the whipped cream and gives it more volume, as well as an extra luxurious texture. It plays the same role in this strawberry cake roll filling, too.
7. Confectioners’ Sugar: Sweetens the cream filling.
8. Graham Crackers: You need 8 full-sheet graham crackers. As the cake chills, the graham crackers soften into delicate cake-like layers. This is the magic of an icebox cake!

The lemony filling adds brightness and tang, while the homemade blueberry sauce brings concentrated berry flavor without making the cake heavy or overly sweet. You will just love this combination!

Make the Blueberry Sauce First

The thick blueberry sauce is the same exact sauce we use for blueberry swirl cheesecake, but I added a little extra lemon.

It cooks and thickens on the stove, then you’ll let it cool completely. Today’s blueberry lemon icebox cake is a wonderful make-ahead recipe for this very reason. You can prep the blueberry sauce up to 3 days in advance, AND you can also prepare the cream filling ahead of time too!

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Make the Cream Filling

One of the most important details in this recipe is the texture of the whipped cream. Beat the cold heavy cream only to soft peaks—not stiff peaks.

You want the whipped cream spreadable and pillowy, almost like a thick pudding. Over-whipped cream can become grainy or too firm, which changes the final texture of the cake.

Here is the whipped cream:

Set the whipped cream aside (transfer to another bowl if using a stand mixer), and whip the cream cheese next. Make sure you use room-temperature cream cheese. You want it to be very softened, otherwise you’ll end up with tiny lumps in your filling.

Then mix in the remaining filling ingredients:

Then fold in the whipped cream:

How to Assemble Blueberry Lemon Icebox Cake

My #1 tip for this recipe: Line your loaf pan with plastic wrap before assembling. This makes it easy to lift out the frozen cake and slice neatly.

Feeling ambitious? You could even add a layer of lemon curd!

The Magic Happens in the Freezer

Unlike many icebox cakes that set in the refrigerator, this loaf-style version holds its shape best when frozen. As it chills, the graham crackers soften into delicate cake-like layers while the lemon cream and blueberry sauce meld together into one creamy, mousse-like dessert.

Once assembled, cover the pan tightly and freeze until firm. Before serving, let the icebox cake sit at room temperature for about 10–15 minutes to slightly soften.

Why? This makes slicing much easier and gives the filling the perfect creamy texture.

This is one of my favorite make-ahead summer desserts because every component can be prepared ahead of time:

• Blueberry sauce: up to 3 days ahead
• Cream filling: up to 2 days ahead
• Fully assembled cake: freeze up to 3 days before serving

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