Fill a large saucepan ¾ with water and season with salt. Bring to the boil
Add your potatoes to the saucepan and boil for 30 mins
Once 30 mins is up test the potatoes with a skewer to ensure they are well cooked. If they are, turn the stove off and let them cool down in the hot water. If not fully cooked, try about 5-10 mins
Drain potatoes. Add dried onion, garlic powder, butter, milk, salt and pepper, stir to combine.
Add horseradish, starting with 1 teaspoon and building to 1 tablespoon. Taste, add up to 1 more tablespoon, tasting as you go.
Spoon into serving bowl, season with cracked pepper and garnish with chopped chives. Add a few little knobs of butter if desired.