Preheat oven to 350°F. In a large bowl, whisk together pumpkin puree, sugar, pumpkin pie spice, cinnamon, and nutmeg.

Add eggs one at a time, mixing well after each addition.

Gradually add milk and mix until smooth.

In a separate bowl, combine flour and melted butter, then fold into the pumpkin mixture.

Pour batter into a greased baking dish and bake for 30 minutes or until a toothpick inserted in the center comes out clean.