Creating this delicious No Bake Summer Berry Icebox Cake is a breeze with these simple steps:

1. Prepare the Berries: Wash and dry your fresh berries. If using strawberries, slice them into halves or quarters.
2. Make the Cream Mixture: In a mixing bowl, combine the heavy whipping cream, mascarpone cheese, powdered sugar, and vanilla extract. Mix on medium speed until soft peaks form.
3. Layer the Base: In your serving dish, lay down a single layer of graham crackers across the bottom. If using a square or rectangular dish, you can break the crackers to fit.
4. Add the Cream: Spread half of the cream mixture over the layer of graham crackers, smoothing it evenly.
5. Add Berries: Sprinkle half of the mixed berries over the cream layer.
6. Repeat Layers: Add another layer of graham crackers, followed by the rest of the cream mixture, and top with the remaining berries.
7. Final Layer: Top with another layer of graham crackers to finish the cake.
8. Chill: Cover with plastic wrap and chill in the refrigerator for at least 4 hours or overnight if possible to let it set completely.
9. Serve: When ready to serve, slice it into squares and garnish with fresh mint leaves, if desired.

These steps will guide you through creating this incredible No Bake Summer Berry Icebox Cake that everyone will rave about!