Heat oven. Heat oven to 400°F.

Blind bake the crust. Chill the unbaked pie crust for at least 20 minutes in the refrigerator or freezer. Line the chilled crust with parchment paper or foil, pressing it gently against the sides. Fill with pie weights or dried beans and bake for 15 minutes. Remove the weights and lining. Reduce oven heat to 350°F.

Prepare the filling. In a medium bowl, whisk together the sugar, corn syrup, vanilla, salt, and cinnamon. Add the eggs and whisk until smooth. Melt the butter in a small saucepan over medium heat for 4–5 minutes, stirring often, until it begins to brown, smell nutty, and turn golden. Slowly drizzle the hot brown butter into the sugar mixture while whisking constantly to prevent the eggs from cooking. Chop 2 cups of the pecans and stir them into the filling.

Assemble. Pour the filling into the blind-baked crust. Arrange the remaining 2 cups of pecan halves decoratively on top.

Bake. Bake the pie for 50–65 minutes, or until done (see notes below). If the crust or pecans begin browning too quickly, tent the pie loosely with foil after the first 20–25 minutes. The pie is ready when the center registers 200°F on an instant-read thermometer. The filling should have a gentle jiggle, like set Jell-O — not loose or wavy. The top will be puffed when it comes out of the oven but will settle flat as it cools. If the center still looks very wobbly after 50 minutes, continue baking in 5-minute increments until the jiggle is just set.

Cool. Place the pie on a wire rack and let it cool completely to room temperature. Then transfer to the refrigerator for at least 3 hours. (This chilling time helps the custard set fully so the slices cut cleanly.)

Serve. Slice and serve with whipped cream, if you’d like. Cover and store leftovers at room temperature for 1–2 days or refrigerated for 4–5 days.