01 - Wrap grated raw potatoes in a clean kitchen towel and squeeze firmly to remove excess moisture until potatoes feel dry to the touch.
02 - In a large mixing bowl, add the squeezed grated potatoes and mashed cooked potatoes, stirring until evenly combined.
03 - Add flour, baking powder, salt, and black pepper to the potato mixture. Mix thoroughly until no dry pockets remain.
04 - Pour in melted butter and whole milk. Stir until a thick, cohesive batter forms that holds its shape when dropped from a spoon.
05 - Heat a large skillet or nonstick frying pan over medium heat. Add a small amount of butter and swirl to coat the bottom.
06 - Drop heaping tablespoons of batter onto the hot skillet, spacing them apart. Use the back of the spoon to gently flatten each portion into a pancake shape about 1/2 inch thick.
07 - Cook for 3 to 4 minutes until the bottom develops a deep golden-brown color and crispy texture.
08 - Flip each pancake carefully and cook another 3 to 4 minutes until both sides are evenly browned and crisp.
09 - Transfer cooked pancakes to a plate lined with paper towels to absorb excess butter. Serve immediately, garnished with chopped chives or scallions if desired.