01. Preparing the Pastry: Begin by mixing 420g of all-purpose flour with 1 tsp of salt in a large bowl. Add 150g of shortening and 50g of butter or margarine, cutting them into the flour until the mixture resembles coarse crumbs. In a separate bowl, lightly beat one medium egg with 65ml of water and 1 tsp of apple cider vinegar, then gradually incorporate this into the flour mixture until a dough forms. Wrap the dough in plastic and chill it in the refrigerator for at least 30 minutes to firm up.

02. Rolling and Pre-baking the Pastry: After chilling, roll the dough on a floured surface into a circle thick enough to fit your quiche or pie dish. Press the dough into the dish, trimming any excess from the edges. To prevent a soggy bottom, brush the pastry with a beaten egg and pre-bake in an air fryer at 180°C for 4 minutes before adding the filling.

03. Preparing the Filling: In a skillet, heat a tablespoon of olive oil or butter over medium heat and sauté one large finely chopped onion until soft and translucent. In a large bowl, combine the sautéed onion with a can of crumbled corned beef, one cup of grated cheese, four large eggs, one cup of heavy cream or milk, ½ teaspoon of salt, ¼ teaspoon of black pepper, and ½ teaspoon of dried thyme. Optionally, add a teaspoon of mustard or Worcestershire sauce for an extra layer of flavor.

04. Assembling and Baking the Quiche: Pour the filling into the pre-baked pastry shell, ensuring it's evenly spread. Bake the quiche in the air fryer oven set to 180°C for about 20 minutes, or until the filling is set and the top is golden brown. It's important to monitor the quiche towards the end of baking time as air fryer temperatures can vary.

05. Cooling and Serving: Once baked in your air fryer oven, allow the quiche to cool slightly on a wire rack to help set the filling, making it easier to slice. This air fryer recipes gem is delicious whether served warm or at room temperature, making it a versatile dish for breakfast, brunch, lunch, or dinner. For a finishing touch, garnish with fresh herbs like parsley or chives. This Corned Beef and Onion Quiche, with its rich flavors and buttery pastry, is sure to be a hit at any meal.