1-First Step: Whip the cream Pour the 3 cups of cold heavy cream into a large mixing bowl. Add the 1/3 cup confectioners sugar, 2 teaspoons vanilla extract or vanilla bean paste, and 1/2 teaspoon almond extract. Beat with a hand mixer or stand mixer until medium peaks form. The cream should look fluffy and hold shape, but still stay smooth and spreadable. If you want the dessert a little sweeter, taste the cream before stopping and beat in a bit more sugar. Keep the mixer speed moderate so the cream does not turn grainy. Cold cream gives the best result, so pull it from the refrigerator only when you are ready to whip.

2-Second Step: Start the base layer Spread a thin layer of whipped cream across the bottom of a 9×13-inch pan. This helps the first layer of graham crackers stay in place. Arrange 20 to 21 full-sheet graham crackers over the cream, breaking them as needed to fit the pan and cover the surface as evenly as possible. This step does not need to look perfect. Small gaps are fine because the crackers soften during chilling and settle into the creamy layers. If you are making a gluten-free version, use your chosen gluten-free crackers the same way.

3-Third Step: Add the strawberry layer Spread 2 cups of whipped cream over the graham cracker layer. Use a spatula to smooth it all the way to the edges. Next, add the 2 cups sliced fresh strawberries in an even layer. The berries should sit nicely on top of the cream without being packed too tightly. The fresh strawberries give this berry icebox cake its sunny flavor and beautiful red color. If your strawberries are very large, slice them thinly so the pieces nestle into the cream more easily. A few extra berries can be saved for the finish.

4-Fourth Step: Add another cracker layer Place another layer of graham crackers over the strawberries. Again, break the crackers where needed so they fit the shape of the pan. This middle layer gives the dessert structure and helps create that classic icebox cake texture after chilling. Try not to press too hard. A gentle placement is enough. The whipped cream will soften the crackers gradually in the fridge, which is what gives the dessert its cake-like bite.

5-Fifth Step: Layer in the blueberries and finish with cream Spread 2 more cups of whipped cream over the crackers. Add the 1 cup fresh blueberries on top of the cream, then finish with the final layer of graham crackers. Spread the remaining whipped cream over the top of the cake, smoothing it into an even, pretty finish. At this stage, the cake already looks beautiful. If you want a cleaner finish, keep a small amount of whipped cream back for final touch-ups after the cake has chilled a bit. An offset spatula makes this job much easier and helps with neat slicing later.

6-Final Step: Chill before serving Cover the pan and refrigerate the icebox cake for at least 3 hours, or up to 48 hours before serving. This chilling time is what turns the crackers soft and gives the dessert its sliceable, cake-like texture. The longer chill, up to a point, helps the layers blend together nicely. Right before serving, add any optional additional berries for garnish. Slice with a sharp knife or offset spatula for the cleanest pieces. Serve cold for the best texture and flavor.