In a small bowl, mix together flour, chili powder, Italian seasoning, garlic powder, salt, and black pepper.
In another small bowl, whisk the eggs.
In a third bowl, combine panko breadcrumbs, chili powder, Italian seasoning, garlic powder, salt, and black pepper. Set aside.
In a mixing bowl, mix leftover mashed potatoes, cheddar cheese, bacon, and parsley until firm enough to hold its shape.
Roll about 3 tablespoons of the potato mixture into balls and place them on a tray.
Freeze the balls for 30 minutes to 1 hour.
Dip each ball into the flour mixture, then into the egg mixture, and finally into the panko breadcrumb mixture. Repeat for all the balls.
Heat vegetable oil in a frying pan to 350°F for shallow frying.
Fry the balls until golden brown all around, frying in batches to avoid overcrowding.
Remove from oil and let drain on a wire rack.
Enjoy them while they're warm!