Combine: Put 15 ounces pumpkin pureé, 14 ounces sweetened condensed milk, 1 egg, 1 ½ teaspoons pumpkin pie spice, 1 teaspoon vanilla extract and pinch kosher salt in a medium mixing bowl. Whisk to combine - the consistency should be smooth.
Fill Crust: Pour the pumpkin pie filling into the store-bought crust and ensure it is spread out evenly.
Bake: Place in oven, middle rack, and let bake 50-55 minutes or until a toothpick comes out clean.
Cool: Remove and let cool completely. Store in the refrigerator for about 1 hour before cutting to serve.
Serve: Enjoy with whipped cream or cool whip on top!
Notes
Storage: cover with aluminum foil or transfer leftovers to an airtight container in the refrigerator for up to 5 days.