Preheat oven to 350°F. Line a 9x9 inch baking pan with parchment paper, leaving an overhang on the sides to easily remove the bars from the pan.
Add the gingersnaps to the bowl of a food processor or high-speed blender and pulse in 2-3 second increments until the cookies are broken down and resemble the texture of wet sand.
10-12 ounces Gingersnap cookies (should yield approximately 2 cups crushed)
Measure out 2 cups of the cookies and transfer to a medium bowl. Stir in the granulated sugar, flour, and melted butter. Stir until completely combined using a rubber spatula. Transfer the crust mixture to the prepared pan. Pre-bake the crust in the preheated oven for 12 minutes.
1/4 cup (50g) granulated sugar, 1/4 cup (31g) all-purpose flour, 1/2 cup (1 stick; 113g) unsalted butter
While it’s baking, make the filling. Add all of the pumpkin filling ingredients to a large bowl and whisk well until it’s completely combined and all of the yellow streaks from the eggs no longer remain.
1 (15-ounce) can pumpkin puree, 1 cup (213g) light brown sugar, 1/2 teaspoon salt, 2 teaspoons pumpkin pie spice, 1 Tablespoon cornstarch, 1 1/3 cups (315ml) half and half, 3 eggs
Pour the batter over the partially baked crust. Carefully transfer it back to the oven and bake for 50-55 minutes, or until the edges and middle are set. It should no longer jiggle in the center if you nudge the side of the pan. Cover the pumpkin pie bars with foil if the edges and tops are looking to brown before the center is completely baked.
Allow the bars to cool completely then remove them from the pan and cut them into squares (Note 4). Cover the bars in plastic wrap or store in an airtight container and store them in the fridge for up to one week. Serve chilled or at room temperature.
Chopped pecans, homemade whipped cream (Note 3), cinnamon sugar, and/or vanilla ice cream for serving