After Farmers' Market Quiche | Saveur

Ingredients

• 1 1⁄2 cups flour
• 1⁄2 cup cornstarch
• 1⁄2 tsp. salt
• 8 tbsp. cold butter, cut into pieces
• 1 tbsp. butter
• 1 large yellow onion, peeled and chopped
• 12 oz. assorted cows' milk cheeses, softer cheeses cut into chunks, harder cheeses grated
• 6 eggs
• 1⁄2 cup milk
• 2 lb. swiss chard, stems and ribs removed, leaves blanced, drained, and finely chopped
• 1 tsp. fresh thyme leaves
• Pinch freshly grated nutmeg
• Salt and freshly ground black pepper