Creating the No Bake Summer Berry Icebox Cake is simple when you follow these clear steps:

1. Prepare the Whipped Cream: In a mixing bowl, combine the heavy whipping cream, powdered sugar, and vanilla extract. Use an electric mixer to whip until soft peaks form.

2. Prepare the Berries: Wash and slice the strawberries if using. In a separate bowl, mix the berries with lemon juice to enhance their flavor.

3. Layer the Graham Crackers: On a serving dish, arrange a layer of graham crackers, covering the base completely.

4. Spread the Whipped Cream: Place a layer of whipped cream over the graham crackers, smoothing it out evenly.

5. Add the Berries: Distribute a mix of the prepared berries over the whipped cream layer.

6. Repeat the Layers: Continue layering with more graham crackers, whipped cream, and berries until you reach your desired height. Make sure to finish with a layer of whipped cream and some berries on top for a beautiful presentation.

7. Cover and Chill: Cover with plastic wrap and refrigerate for at least four hours or overnight. This allows the flavors to blend and the crackers to soften.

8. Serve: Once chilled and ready, slice into portions, adding additional berries or mint leaves for garnish.

By following these straightforward steps, you will create a delightful No Bake Summer Berry Icebox Cake that is bound to impress.