- In a large bowl, mix mashed potatoes, diced ham, cheese, green onions, garlic powder, salt, and pepper until well combined. 
- Form the mixture into small balls or logs using your hands. 
- Roll each croquette in flour, dip in beaten eggs, and coat with breadcrumbs. Set aside on a plate. 
- Heat oil in a deep skillet over medium heat. Fry croquettes in batches until golden brown and crispy, about 2-3 minutes per side. 
- Remove and drain on paper towels. Let cool slightly before serving.