Don’t just dump it all in the middle. Layer it. Start with a thin blanket of cheese on the pie crust. That creates a barrier, stopping the custard from making the bottom soggy.
Pour in half your custard mixture. Add another layer of cheese. Then pour the rest of the custard. The cheese will float and melt into distinct zones, giving you pockets of flavor in every bite.
Fun trick: Sprinkle a final layer of cheese on top five minutes before the quiche is done. It creates a crispy, golden crust hat that looks like a million bucks.