Cauliflower, Onion, and Pancetta Quiche

This cauliflower quiche, with caramelized onions, pancetta, and Gruyère, is one of my favorite takes on quiche, the classic savory egg custard pie. I just took a quick count and realized this is my tenth quiche recipe that I've posted. Clearly, I love quiches, including ones with smoked salmon , zucchini and onion , and ham and asparagus . I also love mini quiches to serve as appetizers, such as…