Sauté the spinach in butter beforehand and squeeze out excess moisture with paper towels to prevent a soggy quiche and ensure the filling sets properly.

Pre-bake your pie crust at 375°F for 8-10 minutes with parchment and pie weights to prevent a soggy bottom and achieve a flaky, crispy texture.

Use a 1:1 ratio of eggs to cream (plus milk) for the perfect custard consistency—too many eggs creates a rubbery texture, while too few won't set properly.

Cut ham into small, evenly-sized cubes rather than chunks so they distribute evenly throughout the quiche and cook at the same rate as the custard.

Remove the quiche when the center still has a slight jiggle (about 1-inch radius) as carryover cooking continues—it will set perfectly as it cools.