From Martha.
Ingredients
2 cups mashed potatoes
1 large egg
1/4 cup grated Parmesan
Coarse salt and ground pepper
1 teaspoon vegetable oil
Instructions
1. In a large bowl, stir together mashed potatoes, egg, and Parmesan. Season with salt and pepper and mix well to combine (mixture will look wet). In a large nonstick skillet, heat vegetable oil over medium-high.
2. In batches, drop heaping spoonfuls of potato mixture into skillet, pressing with a spatula to flatten slightly. Cook until golden brown on bottom, about 3 minutes. Gently flip and cook until golden brown on other side, 3 minutes. Repeat with remaining potato mixture and more oil.