Preheat oven to 350°F (175°C). Grease a 9-inch pie dish.

Peel and chop sweet potatoes, boil for about 20 minutes until tender. Mash until smooth.

Beat softened butter with granulated and brown sugars until fluffy (3-5 minutes).

Add eggs one at a time, mixing thoroughly after each addition.

Pour in milk and vanilla, stir gently until blended.

Mix in cinnamon, nutmeg, ginger, and salt until well distributed.

Fold in mashed sweet potatoes until smooth and combined.

Pour the mixture into the pie crust, smoothing out evenly.

Bake in preheated oven for about 50 minutes; edges should be golden and center slightly jiggly.

Let cool completely on a wire rack before serving.