1. In a bowl, mix together mashed potatoes, potato starch, onions, and spices. Allow to cool completely before frying.
2. Heat a large frying pan to medium-high heat. Pour in oil. With wet hands, form the potato mixture into eight even balls and then flatten into quarter-inch-thick discs. Fry potatoes for two to three minutes, until golden brown and crispy at the edges. Flip and fry again for another two to three minutes. Remove from frying pan and drain on paper towels.
3. To reheat: Bring to room temperature. Place on a cookie sheet and bake at 350 degrees Fahrenheit for 15 to 20 minutes until crispy again.