In a large bowl mix the mashed potatoes, cheddar, flour, egg, salt and pepper together.
In a shallow bowl mix the bread crumbs, garlic powder, onion powder and cayenne together.
Mix the cream cheese and chives together.
Scoop up about 2 teaspoons of the cream cheese and roll it into a ball.
Scoop up ¼ cup of potato mixture flatten it into a thick patty and place the cream cheese in the center. Wrap the potato patty around it and drop it into the crumbs.
Coat with the crumbs and gentlly flatten into a ½-inch thick patty.
Repeat until all the patties are made. Refrigerate 20 - 30 minutes. This will help the patties keep their shape.
In a large frying pan over medium - heat enough oil to generously cover the bottom of the pan and add a pat of butter.
Fry the patties in batches 2 - 3 minutes per side. Remove to paper towels to drain.
Serve with a dollop of sour cream.