Think of your filling as a custard in disguise. At this point, it’s just eggs, milk, and pumpkin puree having a little pool party. The eggs are the lifeguards here; they’ll firm up and save everything once heat enters the chat.
If your filling were thick and scoopable now, you’d end up with a brick of a pie later. Nobody wants a pie you could use as a doorstop, right?
The Science-y Bit (But Make It Fun)
Here’s the magic: proteins in the eggs unravel and then tangle together as they heat up. This is what turns your liquidy situation into a silky, sliceable dessert. It’s alchemy, but with nutmeg. The filling needs to flow evenly in the crust, so it has to be thin enough to settle into every nook and cranny.
If it’s too thick, you’ll have uneven baking and a crust that looks like a lumpy mattress. So, embrace the slosh!
