In a large bowl, whisk together the flour, salt, and sugar. Add the cold cubed butter and use a pastry cutter or your fingertips to work it into the flour until the mixture resembles coarse crumbs with some pea-sized pieces remaining.
Drizzle in ice water, one tablespoon at a time, mixing gently with a fork until the dough just begins to come together. Form the dough into a disk, wrap in plastic wrap, and refrigerate for at least 30 minutes.
Once chilled, roll the dough on a lightly floured surface into a 12-inch circle about ⅛-inch thick. Transfer to a 9-inch pie dish, gently pressing into the bottom and sides. Trim excess dough, leaving a 1-inch overhang, then fold under and crimp decoratively. Return to refrigerator while preparing the filling.
Preheat your oven to 375°F (190°C). In a large bowl, whisk together the pumpkin puree and brown sugar until well combined. Add the eggs one at a time, whisking after each addition until fully incorporated. Mix in the vanilla extract.
In a separate small bowl, combine all the spices with the salt, then add to the pumpkin mixture. Gradually whisk in the evaporated milk until smooth and silky.
Pour the filling into your chilled pie crust. Cover the edges with aluminum foil or a pie shield. Bake on the center rack for 25 minutes, then reduce temperature to 350°F (175°C) and continue baking for an additional 30-35 minutes, until the center is almost set but still slightly wobbly.
Allow your pumpkin pie to cool completely on a wire rack for at least 3 hours or overnight.
Just before serving, place a metal mixing bowl and beaters in the freezer for 10 minutes. Pour the cold heavy cream into the chilled bowl and beat on medium speed until soft peaks begin to form.
Gradually add the maple syrup and vanilla extract, continuing to beat until medium-firm peaks form. Be careful not to overbeat.
Slice your perfectly set pumpkin pie and top each piece with a generous dollop of maple whipped cream. For an elegant finishing touch, sprinkle with a dusting of ground cinnamon if desired.