Begin by gathering all the ingredients in your culinary ensemble.
Combine the finely minced turkey, seasoned mashed potatoes, parsley, and freshly ground black pepper in a culinary symphony.
In a saucepan over medium heat, let the butter melt. Introduce the thinly sliced green onions and cook, stirring, for a harmonious minute. Add the flour and stir until a well-blended melody ensues.
Pour in the chicken broth and milk, continuing the culinary concerto for an additional 2 minutes. Sprinkle salt to taste.
Blend this saucy masterpiece with the turkey amalgamation, ensuring a seamless culinary harmony. Cover and let it rest in the refrigerator until thoroughly chilled, approximately 1 to 2 hours.
On a plate, sprinkle the half-cup of flour. In a separate bowl, compose a sonnet with the eggs and a tablespoon of water. Set up another bowl for the finely ground breadcrumbs.
Shape the croquette mixture into 1 1/2-inch balls (slightly smaller if crafting appetizers).
Gently coat the croquettes in flour, then in the egg mixture, and finally with the breadcrumbs. Place them on a waxed paper or foil-lined cookie sheet. Repeat this culinary ballet with the remaining turkey mixture and breadcrumb cadence.
Let the croquettes stand for approximately 30 to 45 minutes, allowing them to dry and enhance their flavor.
Heat the oil to around 360 F, and fry the croquettes in small, mesmerizing batches for 1 1/2 to 2 minutes, depending on size, until they achieve a golden brown crescendo. Let them drain on paper towels.
Present these savory gems with a side of hot turkey gravy and cranberry sauce, either as the pièce de résistance of a post-holiday meal or as enchanting appetizers for your esteemed guests.