1. Cook chicken. We love to use our Instant Pot for recipes like this.
2. Peel the egg and discard the shell. Dice the egg, using a slicer.
3. In a mixing bowl, add chicken, red onion, celery, relish, mayonnaise, egg and mix well. Season with salt and pepper and mix well.
4. Add spinach or lettuce to a croissant and top with chicken salad and serve.
5. Makes enough for 4 sandwiches.