Preheat oven to 350°F (175°C).

Bake sweet potatoes in the oven for 45 minutes to 1 hour, until soft.

Let the baked sweet potatoes cool for 1 hour.

In a bowl, mash the cooled sweet potatoes with a potato masher until smooth.

Add brown sugar and white sugar to the mashed sweet potatoes.

Melt the butter and add it to the sweet potato mixture.

Add evaporated milk and beaten eggs to the mixture.

Stir in vanilla extract, ground cinnamon, and ground nutmeg.

Pour the sweet potato filling into the pie crust.

Bake for 30 to 45 minutes, or until the filling is set.

Let cool for 1 hour before serving.