Summer Squash, Bacon, and Mozzarella Quiche

INGREDIENTS

• 6.75 ounces all-purpose flour (about 1 1/2 cups)
• 1/2 teaspoon salt
• 3 tablespoons chilled unsalted butter, cut into small pieces
• 2 tablespoons vegetable shortening, cut into small pieces
• 1/4 cup ice water
• Cooking spray
• 1 tablespoon extra-virgin olive oil
• 2 cups (1/8-inch-thick) slices yellow squash
• 2 cups (1/8-inch-thick) slices zucchini
• 1/4 cup chopped shallots
• 1 tablespoon chopped fresh thyme
• 1 cup 2% reduced-fat milk
• 3/4 teaspoon salt
• 1/4 teaspoon freshly ground black pepper
• 4 slices center-cut bacon, cooked and crumbled
• 3 large egg whites
• 3 large eggs
• 3/4 cup (3 ounces) shredded part-skim mozzarella cheese