Dorie Greenspan's Herbed Mushroom Quiche | Oregonian Recipes

Ingredients

• 1-1/4 cups flour
• 1 teaspoon sugar
• 1/2 teaspoon salt
• 6 tablespoons very cold (or frozen) unsalted butter, cut into bits, plus more as needed
• 1 large egg
• 1 teaspoon ice water
• 1-1/2 tablespoons unsalted butter
• 1 small onion, finely chopped
• Salt
• Freshly ground black pepper
• 8 to 12 ounces mushrooms, trimmed, wiped clean with a damp paper towel and cut into 1/4-inch-thick slices
• 3 tablespoons white wine or white vermouth (optional)
• 3 tablespoons finely minced fresh herbs, such as parsley, thyme, rosemary and/or basil
• 1/4 cup grated Gruyere, Swiss or sharp white cheddar
• 3/4 cup heavy cream
• 2 large eggs
• 2 scallions, white and light-green parts only, thinly sliced (optional)