Preheat the oven to 350°F. Spray two 8-inch cake pans with baking nonstick spray. Line the bottom of the pans with 8-inch parchment paper circles and spray again.
In a medium bowl, sift the flour, baking powder, baking soda, cinnamon, ginger, pumpkin pie spice, and nutmeg. Add the salt. Set aside.
3 ½ cups All-purpose flour, 2 teaspoon Baking powder, 1 teaspoon Baking soda, 1 teaspoon Salt, 2 teaspoon Ground cinnamon, 1 ½ teaspoon Ground ginger, 1 teaspoon Pumpkin pie spice, ¼ teaspoon Ground nutmeg
Using a mixer in a large mixing bowl, beat the butter, brown sugar, and sugar on high speed for 3 minutes. Add in the vanilla and sour cream and mix on medium until combined.
1 cup Unsalted butter, 1 ¼ cup Brown sugar, ¼ cup White granulated sugar, 1 teaspoon Pure vanilla extract, ½ cup Sour cream
Add in the eggs and mix on medium until combined. Then, alternate between the dry ingredients and buttermilk. Add ⅓rd of the dry ingredients and half of the buttermilk at a time. Mix on a low speed.
4 Large eggs, 1 cup Buttermilk
Pour the cake batter evenly through the two cake pans. Bake for 25-30 minutes until a toothpick inserted comes out clean.
Let the cakes sit in the hot pans for 10 minutes before transferring to a cooling rack. Cool completely.