Creating Chicken Salad Croissants is simple when you follow these easy steps:

1. Prepare the Chicken: If not already cooked, poach or grill chicken breasts until fully cooked. Allow to cool, then shred into bite-sized pieces.
2. Make the Dressing: In a large bowl, combine mayonnaise, Greek yogurt, Dijon mustard, lemon juice, salt, and pepper. Mix well.
3. Combine Ingredients: Add shredded chicken, chopped celery, grapes, and nuts (if using) to the dressing. Stir until all ingredients are well-coated.
4. Chill (Optional): For enhanced flavors, cover the bowl with plastic wrap and refrigerate for at least 30 minutes.
5. Prepare Croissants: While the chicken salad chills, slice the croissants in half horizontally.
6. Assemble: Place a generous scoop of the chicken salad mixture on the bottom half of each croissant. Top with a lettuce leaf, then place the top half of the croissant on top.
7. Serve: Arrange the assembled croissants on a serving platter and enjoy!

These straightforward steps will guide you in creating delicious Chicken Salad Croissants effortlessly.