Creating this delicious Icebox Cake is easy if you follow these steps:

1. Prepare whipped cream: In a large mixing bowl, combine heavy whipping cream, powdered sugar, and vanilla extract. Whisk until soft peaks form.
2. Layer graham crackers: In a rectangular dish, arrange a layer of graham crackers to cover the bottom. You may break them to fit, as necessary.
3. Spread cream: Spread a generous layer of the whipped cream mixture over the graham crackers.
4. Add fruits: Layer some fresh strawberries, blueberries, and banana slices over the cream.
5. Repeat layers: Repeat the process of graham crackers, cream, and fruit, until all ingredients are used, finishing with a layer of cream on top.
6. Decorate: If desired, sprinkle chocolate shavings on top for an extra layer of flavor and visual appeal.
7. Cover and chill: Cover the dish with plastic wrap and refrigerate for at least 4 hours or overnight.
8. Serve and garnish: Before serving, garnish with mint leaves for added freshness and color.