Preheat oven to 350°F

Place sweet potatoes in a large pot and fill with water just until it covers them. Bring to a boil and boil for 45 -50 minutes or until tender

When done, let cool and then remove the skin. It should peel off very easily

Place peeled sweet potatoes in a bowl and break it up with a fork

Use a mixer to mix the sweet potatoes until smooth and creamy.

Add in butter and mix to combine.

Add in sugars, milk, eggs, nutmeg, cinnamon, vanilla and flour. Beat until mixture is smooth.

Pour into prepared pie crust and bake for 55-60 minutes.

Let cool on the counter for about 30 minutes and then chill in the refrigerator for at least 3 hours to fully set.