Start by combining the graham cracker crumbs, sugar, and cinnamon in a bowl. Then, stir in the melted butter until the mixture is evenly moistened. Press it firmly into a 9-inch pie pan, making sure the edges are neat and even.
In a separate bowl, whisk together the pumpkin puree, brown sugar, salt, and spices. Beat in the eggs, then gradually stir in the evaporated milk until smooth. Taste and adjust the spices if needed.
Pour the pumpkin filling into the prepared crust, spreading it evenly. Tap the pan gently on the counter to release any air bubbles. This helps the pie cook evenly without cracking.
Preheat your oven to 350°F (175°C) and bake the pie for 50-60 minutes. The filling should be set but slightly jiggly in the center. Let it cool completely at room temperature before slicing.
Once cooled, refrigerate the pie for at least 2 hours. Chilling helps the flavors meld and makes slicing easier. Serve plain or with whipped cream and a sprinkle of cinnamon for a stunning presentation.