Apple Cinnamon Muffins

Preheat your oven to 375°F (190°C) and line a muffin tin with paper liners or grease the tin thoroughly.

In a large bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg.

In another bowl, combine the melted butter and granulated sugar, stirring until well mixed.

Add the eggs, one at a time, beating well after each addition. Stir in the vanilla extract.

Gradually add the dry ingredients to the wet mixture alternately with the milk, starting and ending with the dry ingredients. Stir just until combined; do not overmix.

Gently fold in the diced apples and nuts (if using) until they are evenly distributed throughout the batter.

Spoon the batter evenly into the prepared muffin cups, filling each about 3/4 full. Sprinkle the tops with brown sugar for a sweet, crunchy layer.

Bake in the preheated oven for 18-22 minutes, or until a toothpick inserted into the center of a muffin comes out clean.

Allow the muffins to cool in the pan for about 5 minutes before transferring them to a wire rack to cool completely.