Making the No Bake Summer Berry Icebox Cake is straightforward when you follow these simple steps:

1. Prepare the Berries: Rinse the mixed berries under cold water. Slice strawberries if using whole ones. Set aside.
2. Make the Cream Mixture: In a large mixing bowl, beat the heavy whipping cream until soft peaks form.
3. Combine Ingredients: Gently fold in the mascarpone cheese, powdered sugar, and vanilla extract into the whipped cream until well combined.
4. Assemble the Cake: In a suitable dish, place a single layer of graham crackers at the bottom.
5. Layer the Cream: Spread half of the cream mixture over the crackers, followed by a layer of mixed berries.
6. Repeat Layers: Add another layer of graham crackers, then top with the remaining cream mixture, and finish with more berries on top.
7. Cover and Chill: Cover the dish with plastic wrap or a lid and refrigerate for at least 4 hours or until set.
8. Serve: Once chilled, slice and serve, garnishing with mint leaves if desired.

This simple process will guide you to a stunning dessert that’s perfectly refreshing!