Preheat oven to 375°F. Lightly grease a 2 1/2-quart casserole dish or ramekins and set aside.
Peel and roughly chop sweet potatoes into large chunks. Place into a large pot and cover with water. Bring water to a boil, reduce heat to medium-high, and gently boil for 10 to 20 minutes, until the potatoes are fork tender and drain, and place into a large bowl.
