1. Combine berries and 1 Tbsp. sugar in a large bowl. Mash with the back of a spoon until a little juice seeps out.
2. In another bowl, whisk yogurt, remaining sugar, triple sec, vanilla and lemon zest. Add yogurt mixture and cookies to blueberries and gently fold with a rubber spatula just until streaks of blueberries swirl through the yogurt. Spoon into glass dishes and serve immediately.