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In a separate large bowl, combine the cream and remaining sugar. Whisk until soft peaks form.
In a plastic sandwich bag, crush the graham crackers with a sturdy, heavy object until they become crumbs.
Assemble your parfait by alternating layers of yogurt, macerated strawberries, graham cracker crumbs and whipped cream until each glass is full. If you'd like, grate chocolate on top for garnish. Serve immediately.