Creating the Spiced Pear Bundt Cake is straightforward when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a Bundt pan.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, ginger, and salt.
3. Cream Butter and Sugar: In another bowl, beat the softened butter and granulated sugar until light and fluffy.
4. Add Eggs and Vanilla: Add the eggs one at a time, mixing well after each addition. Then stir in the vanilla extract.
5. Combine Mixtures: Gradually add the dry ingredient mixture to the butter mixture, alternating with the buttermilk. Begin and end with the dry ingredients, mixing until just combined.
6. Fold in Pears and Nuts: Gently fold in the diced pears and walnuts (if using) until evenly distributed.
7. Pour Batter: Pour the batter into the prepared Bundt pan, spreading it evenly.
8. Bake: Bake in the preheated oven for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
9. Cool: Remove the cake from the oven and let it cool in the pan for about 10-15 minutes. Then, carefully invert it onto a wire rack to cool completely.
10. Dust with Powdered Sugar: Once cooled, dust the top with powdered sugar before serving, if desired.

These steps will guide you to create a stunning and delicious Spiced Pear Bundt Cake that will wow your family and friends.