Irish Potato Cakes

1. Add the mashed potatoes to a large mixing bowl.
2. Add half of the flour, the onion powder and salt. Mash together.
3. Add half of the melted butter and the beaten egg. Mix together to form a dough. Add additional flour as necessary.
4. Transfer the potato dough onto a floured surface. Knead lightly and flatten into a circle with a thickness around 1/2 inch.
5. Use a round cookie or scone cutter to cut out potato cakes. Re-knead the dough remnants to cut out more circular potato cakes.
6. Melt the remaining half of the butter in a large skillet. Add the potato cakes in a single layer. Fry on medium-low heat for 8 to 10 minutes on each side, until they are a golden brown color.
7. Serve immediately as a side dish for grilled fish, pork chops or any main course of choice.