Step 1

In a large bowl, combine all ingredients (except for butter) and stir until well combined.

Step 2

Heat the two tablespoons of butter in a large, heavy skillet (such as cast iron) over medium-high heat until melted.

Step 3

Use a disher scoop (or 1/4 cup measure) to scoop out the potato mixture and add to the skillet. Use the back of a spatula to flatten the patty out so it's about 1/2" thick.

Step 4

Fry for about 3 minutes, or until golden brown, then flip over and cook for another 3 minutes. Remove to a plate.

Step 5

Repeat with remaining potato mixture, adding more butter to the skillet if needed.

Step 6

Serve hot, topped with sour cream and chopped herbs or chives, if desired.