Creating this No Bake Summer Berry Icebox Cake is a straightforward process. Follow these steps to achieve a magnificent dessert:

1. Prepare the Whipped Cream: In a large bowl, whip the heavy cream until soft peaks form.
2. Mix Cream Cheese: In another bowl, beat the softened cream cheese with powdered sugar and vanilla extract until smooth.
3. Combine Mixtures: Gently fold the whipped cream into the cream cheese mixture until well incorporated.
4. Set Up Your Base: In a rectangular baking dish, create a layer with graham crackers or biscuit cookies.
5. Add Cream Layer: Spread a generous portion of the cream mixture over the crackers, smoothing it out evenly.
6. Layer the Berries: Top the cream with a layer of mixed berries, spreading them evenly across.
7. Repeat: Continue layering with more graham crackers, cream, and berries until you run out of ingredients, finishing with berries on top.
8. Chill: Cover the dish with plastic wrap and place it in the refrigerator. Allow it to chill for at least 4 hours or overnight.
9. Slice and Serve: Carefully slice into squares and serve chilled, garnished with mint leaves if desired.

By following these steps, you’ll have a stunning No Bake Summer Berry Icebox Cake that is not only simple to make but also deliciously satisfying!