Mushroom, Gruyère & Spinach Quiche

Name: Mushroom, Gruyère & Spinach Quiche
Cook time: 1 h 30 min
Total time: 1 h 30 min
Cuisine: French, Mediterranean, European
Ingredients: 1 cup plus 2 tablespoons unbleached all-purpose flour; 0.75 teaspoon kosher salt, divided; 0.5 teaspoon freshly ground black pepper, divided; 0.25 teaspoon baking powder; 0.25 cup extra-virgin olive oil; 3 tablespoons ice water; Cooking spray; 3 center-cut bacon slices; 0.25 cup chopped shallots; 1 (8-ounce) package presliced mushrooms; 2 teaspoons fresh thyme; 2 cups packed baby spinach; 1 cup 1% low-fat milk; 0.33 cup half-and-half; 3 large eggs; 1 large egg white; 2 ounces cave-aged Gruyère cheese, grated