01 - Combine cooked chicken, celery, red onion, mayonnaise, Dijon mustard, fresh dill, parsley, lemon juice, salt, and pepper in a mixing bowl. Mix thoroughly until all ingredients are evenly distributed and creamy consistency is achieved.
02 - Slice cucumbers lengthwise using a vegetable peeler or mandoline to form thin, wide ribbons. Discard the initial slice of predominantly skin. Continue slicing until you reach the seeded center, ensuring ribbons remain pliable without tearing.
03 - Gently pat cucumber ribbons with paper towels to absorb surface moisture. This step prevents filling from becoming watery and ensures roll ups maintain structure.
04 - Place a cucumber ribbon on a flat surface. Spread approximately 1 tablespoon of chicken salad mixture along one short end. Add a baby spinach leaf if desired. Roll tightly from the filled end, securing seam underneath. Transfer to serving platter seam-side down.
05 - Continue rolling remaining cucumber ribbons with chicken salad filling until all components are used. Arrange completed roll ups attractively on serving platter.
06 - Refrigerate roll ups for 10 minutes to allow flavors to meld and improve texture. Serve chilled for optimal taste and structural integrity.