Preheat the oven to 350°F (175°C).
In a large mixing bowl, cream the butter and sugar until light and fluffy.
Add eggs one at a time, mixing well after each addition.
Stir in the vanilla extract and buttermilk until combined.
In a separate bowl, combine the flour, baking powder, cinnamon, nutmeg, and chopped pecans.
Gradually add the dry mixture to the wet ingredients, mixing just until incorporated.
Pour the batter into a greased cake pan and smooth the top evenly.
Bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.
Allow the cake to cool in the pan for 10 minutes before transferring to a wire rack.
Once cooled, frost with your favorite cream cheese frosting.
