In a mixing bowl, combine the heavy whipping cream, powdered sugar, vanilla extract, cocoa powder, and salt. Using an electric mixer, whip the mixture on medium-high speed until stiff peaks form.
In a 9x13 inch baking dish, spread a thin layer of the whipped chocolate cream on the bottom.
Layer half of the chocolate wafer cookies (about 6-8 cookies) over the whipped cream, slightly overlapping them.
Spread half of the sliced strawberries over the cookies, followed by another layer of whipped chocolate cream.
Repeat the layers: another set of cookies, the remaining strawberries, and top with the last layer of chocolate cream.
Smooth the top layer with a spatula and refrigerate the cake for at least 4 hours, or ideally overnight, to allow the cookies to soften and the flavors to meld.
Before serving, garnish the top of the cake with chocolate shavings or curls for an elegant touch.
Notes
Slice the cake into squares and serve on individual plates, decorated with extra strawberry slices or a drizzle of chocolate syrup.