1. Prepare the Protein Base: In a medium-sized mixing bowl, combine the shredded or diced cooked chicken breast. Ensure the chicken is fully cooled before proceeding.

2. Mix the Creamy Dressing: Add the plain Greek yogurt, mayonnaise, Dijon mustard, garlic powder, and black pepper to the bowl with the chicken. Stir thoroughly until all the chicken is evenly coated and the dressing is well combined.

3. Incorporate the Crunch and Flavor: Fold in the finely chopped celery and red onion. If using, add the chopped walnuts or pecans at this stage. Mix gently to distribute these ingredients throughout the chicken mixture. This creates your flavorful and protein-rich chicken salad.

4. Portion the Chicken Salad: Divide the chicken salad evenly among the four individual snack containers. Place it in one of the main compartments of each container.

5. Add the Crunchy Vegetables: In separate compartments of each container, arrange the baby carrots, cucumber slices, and bell pepper strips. Aim for an even distribution across all four boxes, ensuring a colorful and appealing presentation.

6. Include the Dipping Elements: In the remaining compartment of each container, add the whole-wheat pita bread wedges or whole-grain crackers. Make sure they are placed in a way that they won’t get soggy from the chicken salad.

7. Seal and Store: Securely close the lids on all four snack containers. Your high-protein winter crunch snack boxes are now ready for refrigeration and future enjoyment.