01 - Preheat oven to 350°F. Grease and flour a 9-inch round cake pan or line with parchment paper.
02 - In a large bowl, whisk together flour, brown sugar, baking powder, baking soda, salt, cinnamon, ginger, and nutmeg.
03 - In a separate bowl, whisk vegetable oil, eggs, yogurt, and vanilla extract until smooth.
04 - Add wet ingredients to dry ingredients and gently mix until just combined.
05 - Carefully fold diced pears and chopped walnuts into the batter.
06 - Pour batter into prepared pan and smooth the top with a spatula.
07 - Bake for 40 to 45 minutes, or until a toothpick inserted into the center comes out clean.
08 - Let cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
09 - Serve plain or dusted with powdered sugar as desired.