Prepare the Beef Filling: Heat a skillet over medium heat and add the ground beef. Cook the beef, breaking it apart with a spoon. Add the minced garlic, chopped onion, chili flakes, paprika, salt, and pepper. Cook for about 5-7 minutes until the beef is fully browned and fragrant. Remove from heat and let the mixture cool.
Shape the Croquettes: Once the beef mixture has cooled slightly, add the egg to the mixture and stir to combine. Shape the mixture into small oval or cylindrical croquettes, approximately 2-3 inches long.
Coat and Fry: Set up a breading station with flour, beaten egg, and breadcrumbs. Coat each croquette in flour, dip it in beaten egg, and roll it in breadcrumbs. Heat oil in a frying pan over medium heat. Fry the croquettes in batches for 3-4 minutes on each side or until they turn golden brown. Drain on paper towels and serve hot.