Cut sweet potatoes into evenly sized chunks. Place in a large pot, cover with cold water by 1 inch, add a pinch of salt, bring to a boil, then simmer until fork-tender (15–20 minutes).
Drain the potatoes well and return them to the warm pot for a minute to let steam evaporate so the mash isn’t watery.
Mash the hot sweet potatoes with a potato masher or pass through a ricer for smoothness. Stir in Greek yogurt, olive oil, minced garlic, lemon juice, salt, pepper, and smoked paprika if using. Taste and adjust seasonings.
Transfer to a serving bowl, garnish with chopped chives or parsley and optional toasted pepitas. Serve warm.
Notes
For an ultra-smooth texture, use a ricer before adding yogurt.
Warm the yogurt slightly so it blends without cooling the potatoes.
To make dairy-free, swap Greek yogurt for unsweetened coconut yogurt and add a tablespoon more olive oil.
Make ahead: reheat gently with a splash of milk or broth to loosen the mash.