Mix all ingredients together in a bowl until a smooth mixture is achieved.
Pour mixture into pie crust.
Place pie (which should be on a lined baking sheet) into the 425°F oven for 15 minutes. After 15 minutes, adjust oven heat to 350°F. Bake pie for an additional 40-50 minutes until a knife inserted in the center comes out clean.
Check on the pie once during baking to make sure that the rim of the crust is not over-browning. If so, use a pie shield or a rim of aluminum foil to protect the crust during the remaining baking time.
Allow pie to cool for 2 hours at room temperature (or refrigerate) before serving.
If desired, whip cream and dollop onto pie. Whipped cream can be mixed with cinnamon, but I recommend not adding sugar as this pie is quite sweet and the unsweetened cream offers a nice complement to the pie.