01 - Preheat oven to 400°F. Lightly grease a baking sheet or line with parchment paper.
02 - If using fresh potatoes, peel and boil until tender. Drain thoroughly and mash with 2 tablespoons butter and milk until smooth. Season with salt and pepper. Allow to cool slightly.
03 - In a large mixing bowl, combine cooled mashed potatoes, sharp cheddar, Parmesan, eggs, chives, smoked paprika, and flour. Mix thoroughly until fully incorporated and smooth.
04 - Using a spoon or small ice cream scoop, portion mixture into 12 evenly-sized dollops onto the prepared baking sheet, spacing them 2 inches apart.
05 - Brush the tops of each puff lightly with melted butter to promote golden-brown coloring during baking.
06 - Bake for 25 to 30 minutes until puffs are golden brown, puffed, and set in the center.
07 - Let cool on baking sheet for 3 to 5 minutes to set. Serve warm, optionally with sour cream for dipping.