Mashed Sweet Potatoes

3 medium sweet potato(es), peeled and cut into 1-inch chunks (about 2 pounds)
2 medium garlic clove(s), peeled
1/2 cup(s) plain fat-free yogurt, Greek-variety recommended
4 tsp sugar
1/8 tsp table salt, or more to taste
1/8 tsp black pepper, freshly ground, or to taste

Place potatoes and garlic in a large saucepan and pour in enough water to cover potatoes. Set pan over high heat and bring to a boil. Boil until potatoes are fork-tender, about 8 minutes.

Drain potatoes and garlic; transfer potatoes and garlic to a large bowl. Add yogurt and sugar to bowl; mash until smooth. Season to taste with salt and pepper.

Yields about 1/2 cup per serving.