Mix mashed potatoes, garlic, cheese, egg and flour, salt & pepper until blended. Mixture will be thick but spoonable.
In a skillet, melt 2 tablespoons butter, with spoon, place mixture into skillet, let cook a few minutes until edges start to brown, flip and continue cooking until browned. Similar to pancakes. Continue until all potatoes are cooked. Use additional butter, if skillet dries out.