- Place butter and sugar into the bowl of a stand mixer. Cream together until light and fluffy.While the butter creams, sift together both flours, baking powder, and salt. Do this a second time to ensure a light and fluffy cake.Preheat oven to 325F.With the mixer on, add the eggs one at a time. Make sure to allow the egg to fully combine before adding the next one. Pour in the vanilla and combine.
- Pour the dry mixture into the batter, followed by the milk, alternatively, starting and ending with the dry ingredients. Work in about 1/2 cup increments for the dry ingredients, and about 1/4 cup increments for the milk.Prepare two 9-inch cakes pans with shortening and flour. Pour the batter into the pans, evenly, about halfway full.
- Bake for about 30-35 minutes, or until toothpick comes clean. Set the pans on cooling racks and allow them to sit for about 10 minutes. Flip the pans over and tap the cakes out, allowing them to finish cooling on the wired racks.