1-First Step: Mise en Place and Prep Your Pan Clear a workspace and chill your mixing bowl and beaters in the freezer for 15 minutes this helps cream whip faster. Line a 9×13-inch dish or trifle bowl with plastic wrap for easy removal. Rinse and pat dry raspberries; set aside 1 cup whole for topping. Zest lemons first, then juice them. Measure all ingredients. This setup prevents rushed mistakes and keeps everything cold for best results in your lemon raspberry layer cake.

2-Second Step: Whip the Lemon Cream Filling Pour 3 cups cold heavy cream into the chilled bowl. Beat on medium speed with an electric mixer until soft peaks form, about 2 minutes. Gradually add 1 cup powdered sugar, lemon zest, 1/2 cup lemon juice, and vanilla. Increase to high speed and whip to stiff peaks, 3-4 more minutes. Stop when it holds shape but stays spreadable overwhipping turns it buttery. Taste and adjust sugar if lemons are extra tart. This cream is the heart of your easy lemon raspberry cake, providing moisture and lift.

3-Third Step: Macerate the Raspberries In a bowl, combine 3 cups raspberries with 1/4 cup powdered sugar. Gently mash with a fork until juicy but chunky 2-3 minutes. Let sit 10 minutes to release juices, creating a raw filling that soaks into layers. Stir once more. If berries are very tart, add a teaspoon more sugar. This step builds intense flavor without cooking, fitting our no-heat style perfectly.

4-Fourth Step: Assemble the Layers Start with a thin layer of lemon cream on the bottom of the dish to anchor everything. Break graham sheets to fit, creating an even first layer about 6 sheets. Spread 1/3 of the remaining cream over grahams. Spoon 1/3 of macerated raspberries evenly on top. Repeat: grahams, cream, raspberries two more times, ending with cream. Use an offset spatula for smooth layers. Press gently to compact. This builds the moist cake texture as grahams soften over time.

5-Fifth Step: Chill and Set Cover tightly with plastic wrap and refrigerate at least 6 hours, ideally overnight. The lemon juice and cream juices turn firm grahams into soft, moist layers bursting with flavor. After chilling, top with reserved whole raspberries and mint. Dust with powdered sugar if desired. Slice with a sharp knife dipped in hot water for clean cuts.