Cut potatoes into small pieces and soak in water to remove excess starch. Cut avocado in half, then dice half into 2cm cubes. Beat the egg in a bowl.

Place potatoes in a microwave-safe container, cover loosely with plastic wrap, and microwave at 600W for 4 minutes.

Mash the microwaved potatoes and the undiced avocado while still hot. Add salt, pepper, mayonnaise, and diced avocado, then mix well.

Divide the mixture into 4 portions. Place 1/4 of the pizza cheese in the center of each portion and shape into balls. Coat each ball in flour, beaten egg, and breadcrumbs sequentially.

Heat salad oil in a pot to 170°C. Fry the croquettes until golden brown, turning occasionally.