Assorted Mini-Quiches

Preparation

1. Arrange the tartlet shells on a sheet tray lined with parchment in 4 rows of 12 shells each.
2. Prepare the ham and caramelized onion filling:
   • Place the butter, onions, and salt in a 12-in. (30-cm) nonstick pan and cook them over low heat, stirring often, until t