Caramelized Onion and Gorgonzola Quiche

INGREDIENTS

• All-purpose flour, for dusting
• Tart Dough
• 1 tablespoon extra-virgin olive oil
• 1 pound onions, cut crosswise into rings
• 2 large eggs
• 1/2 cup milk
• 1/2 cup heavy cream
• 1 teaspoon coarse salt
• Freshly ground pepper
• 2 ounces gorgonzola dolce