Easy Gluten-Free Quiche Lorraine

Name: Easy Gluten-Free Quiche Lorraine
Prep time: 15 min
Cook time: 50 min
Total time: 1 h 5 min
Cuisine: European, Mediterranean, French
Ingredients: 2.5 cups gluten-free all purpose baking flour; 2 teaspoons xanthan gum; 0.5 teaspoon salt; 0.5 cup butter, cubed; 1 egg; 0.5 cup cold water; 1 tablespoon Dijon mustard; 0.5 cup cubed pancetta; 2 onions, sliced; 2 eggs; 1 cup heavy cream; 0.5 teaspoon ground black pepper; 1 pinch ground nutmeg; 2 cups shredded Gouda cheese