Prepare the Whipped Cream: In a large bowl, beat the heavy whipping cream, powdered sugar, and vanilla until stiff peaks form. Set aside.
Make the Lemon Filling: In another bowl, beat the cream cheese until smooth. Add sweetened condensed milk, lemon juice, and lemon zest. Mix until fully combined and creamy.
Layer the Cake: In a 9x13-inch dish, place a layer of graham crackers at the bottom. Spread a layer of the lemon mixture over the crackers, then sprinkle with fresh raspberries. Repeat layers until all ingredients are used, ending with the lemon mixture.
Chill & Set: Cover and refrigerate for at least 4 hours, or overnight for the best texture.
Garnish & Serve: Before serving, top with extra raspberries and lemon zest. Slice and enjoy!