Add the baked shredded or chopped chicken in a large bowl.
Stir in the mayonnaise.
Mix in the onions, celery, and carrots.
Next, stir in the salt, dill weed, onion powder, mustard powder, and pepper.
To assemble the sandwiches, you will need to cut each croissant in half horizontally and spread a little mayo on the bottom piece.
Add a slice of cheese to the bottom slice of the croissant.
Scoop a generous portion of chicken salad on top of the cheese.
Top with the top half of the croissant.