Step 1

Arrange an oven rack in lowest position and heat the oven to 425°F. Place the pumpkin purée, sweetened condensed milk, eggs, and pumpkin pie spice in a large bowl and whisk until combined.

Step 2

If making 2 (9-inch) pies: Divide the filling between 2 blind baked 9-inch pie shells. Bake for 15 minutes. Reduce temperature to 350°F and bake until a knife inserted in the center comes out clean, 15 to 20 minutes more. Let cool on a wire rack for 2 hours. Serve immediately or refrigerate until ready to serve.

Step 3

If making 1 (9-inch) deep dish pie: Pour the filling into an unbaked 9-inch deep dish pie shell. Bake for 15 minutes. Reduce temperature to 350°F and bake until a knife inserted in the center comes out clean, 35 to 40 minutes more. Let cool on a wire rack for 2 hours. Serve immediately or refrigerate until ready to serve.