01 - In a medium mixing bowl, combine shredded chicken, mayonnaise, Greek yogurt, Dijon mustard, celery, red onion, dill, lemon juice, salt, and pepper. Mix thoroughly until all ingredients are evenly incorporated and creamy.
02 - Wash and dry cucumbers thoroughly. Using a mandoline or vegetable peeler, slice cucumbers lengthwise into long, thin ribbons, approximately 16 even slices total for consistent roll ups.
03 - Lay a cucumber ribbon flat on a clean work surface. Spread approximately 1 1/2 tablespoons of chicken salad mixture along one end. Top with julienned carrots if using for added crunch and color.
04 - Gently roll the cucumber ribbon from the filled end, tucking the filling inside as you roll. Place seam side down on a serving platter to prevent unrolling.
05 - Repeat the rolling process with remaining cucumber ribbons and chicken salad until all filling is used. Arrange completed roll ups neatly on the serving platter.
06 - Serve immediately for optimal freshness. Alternatively, cover and refrigerate for up to 2 hours before serving; extended refrigeration may cause cucumbers to soften.