Prepare the Loaf Batter:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×5-inch loaf pan or line it with parchment paper to prevent sticking.

2. Prepare the Apples: Peel, core, and chop the apples into small chunks. If you want to prevent them from browning, you can toss them with a teaspoon of lemon juice. Set them aside.

3. Mix the Dry Ingredients: In a medium bowl, sift together the all-purpose flour, baking powder, baking soda, cinnamon, nutmeg, and salt. Set this mixture aside.

4. Cream the Butter and Sugar: In a large bowl, cream the softened butter and granulated sugar together using an electric mixer on medium speed until the mixture is light and fluffy (about 3-5 minutes).

5. Add the Eggs and Vanilla: Add the eggs, one at a time, beating well after each addition. Then stir in the vanilla extract until fully combined.

6. Alternate Adding Dry Ingredients and Buttermilk: Gradually add the dry ingredients to the wet ingredients in three parts, alternating with the buttermilk. Start and end with the dry ingredients. Mix gently to combine; be careful not to overmix.

7. Fold in the Apples: Gently fold the chopped apples into the batter, ensuring they are evenly distributed throughout.

Bake the Loaf:

8. Transfer to the Pan: Pour the batter into the prepared loaf pan. Smooth the top with a spatula.

9. Add the Topping (Optional): For a little extra sweetness, sprinkle a tablespoon of brown sugar over the top of the batter before baking.

10. Bake: Bake in the preheated oven for 55-60 minutes or until the top is golden brown, and a toothpick inserted into the center comes out clean or with a few moist crumbs.

11. Cool: Allow the loaf to cool in the pan for 10-15 minutes before transferring it to a wire rack to cool completely.

Slice and Serve:

12. Slice the Loaf: Once the loaf has cooled, slice it into 1-inch thick pieces. Serve it with a cup of coffee or tea, or enjoy it as a sweet snack.