Steps for Making Pumpkin Pie Filling
Blend the brown and white sugar in the food processor, if needed, until it's the texture of powdered sugar.
Add pumpkin puree.
Add salt, spices, then pulse or blend.
Add in butter, pulse, or blend.
Add milk, pulse or blend.
Add each egg one at a time, so it appropriately incorporates.
Add the cornstarch last, blend well
Pour the filling into the pie crust, then bake in the oven on the middle rack for fifteen minutes at 400 degrees Fahrenheit. After fifteen minutes, turn the temperature to 350 degrees Fahrenheit, and bake for another 30 to 50 minutes. The pie should slightly jiggle, but a toothpick inserted into the center will come out clean.
Remove the pie from the oven and allow it to cool on a cooling rack for thirty minutes. Cover, and then place in the refrigerator.
Serve it cold or at room temperature. Cold servings tend to have a thicker and creamier texture.