Cook the ground chicken, celery, and onion in a skillet over medium heat until the chicken is thoroughly cooked.
Stir in the flour, salt, and pepper after adding them.
Whisk the egg and milk together in a bowl.
The chicken mixture should be dipped into the egg mixture before being breaded.
Over medium heat, warm the oil in the skillet.
Cook the chicken croquettes for 3–4 minutes on each side, or until crispy and golden brown.
Serve with your preferred gravy or dipping sauce. Enjoy!