1. Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
2. In a medium bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg.
3. In a separate large bowl, whisk the melted butter and sugar until well combined. Add the eggs, one at a time, mixing well after each addition. Stir in the vanilla extract.
4. Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk, starting and ending with the dry ingredients. Mix until just combined.
5. Gently fold in the diced apples.
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