Do I need to cook the broccoli first?
Yes, at least a little. Raw broccoli stays too crunchy and can release moisture as the quiche bakes. Steam or blanch it until bright green and just tender, then drain and pat dry.
Can I use frozen broccoli?
Absolutely. Thaw completely, then squeeze out as much water as you can. I like to wrap it in a clean towel and wring it out over the sink. Dry broccoli equals creamy custard.
How do I keep my quiche from getting watery?
The big three: cook and dry the broccoli, do not overdo the dairy, and avoid adding wet mix-ins without draining them first. Also let the quiche rest 15 minutes after baking so the custard finishes setting.
How do I know when it is done?
The edges should be set and slightly puffed, and the center should have a small wobble like set gelatin, not a slosh. If you have an instant-read thermometer, aim for about 165°F in the center (up to 170°F is fine). Pull it while it still wobbles a bit since it keeps setting as it rests.
Can I make this ahead?
Yes. For best texture, bake it the day before, cool, refrigerate, then reheat at 325°F until warm. You can also prep the fillings ahead: cook and dry the broccoli, shred the cheese, and whisk the custard so assembly is fast. If you want to assemble it unbaked, you can refrigerate the filled crust for a few hours, then bake as directed.
What cheeses work besides cheddar?
Gruyere, Swiss, fontina, or pepper jack are all great. Keep at least some cheddar or a flavorful cheese in the mix so the broccoli does not taste flat.