- Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish or line it with parchment paper for easy removal. 
- In a large mixing bowl, whisk together the flour, sugar, baking powder, baking soda, and salt until well combined. 
- Add the softened butter, eggs, and vanilla extract to the dry ingredients. Mix until the batter is smooth and well combined. 
- Fold in the diced apples, cinnamon, walnuts, and raisins (if using) until evenly distributed throughout the batter. 
- Pour the batter into the prepared baking dish, spreading it evenly. 
- Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted in the center comes out clean. 
- Allow the Apple Delight to cool in the pan for about 10 minutes before slicing and serving.