Creating crunchy smoked fish croquettes is a straightforward process. Here’s how you can make them step-by-step:

1. Prepare the Mixture:
   a. In a large mixing bowl, combine the mashed potatoes, flaked smoked fish, chopped parsley, and one beaten egg.
   b. Season the mixture with salt and pepper.
   c. Mix until all ingredients are well incorporated.
2. Shape the Croquettes:
   a. Take a small portion of the mixture and shape it into a ball or oval, depending on your preference.
   b. Repeat with the remaining mixture until all is used.
3. Prepare for Frying:
   a. Set up a breading station with three shallow dishes—one with flour, one with the remaining beaten egg, and one with breadcrumbs.
   b. Roll each croquette first in the flour, then dip it in the beaten egg, and finally coat it with breadcrumbs. Ensure each croquette is evenly covered.
4. Fry the Croquettes:
   a. Heat vegetable oil in a deep pan over medium heat. Ensure the oil is hot enough by dropping a small piece of breadcrumb into the oil; it should sizzle immediately.
   b. Fry the croquettes in batches, turning occasionally, until they are golden brown and crispy on all sides. This should take about 3-4 minutes per batch.
   c. Remove from the oil and drain on paper towels to remove excess oil.
5. Serve Warm:
   a. Transfer the croquettes to a serving dish and serve them warm for the best flavor and texture.