Step 1

Preheat the oven to 350 degrees F. Butter a 9-by-5-inch loaf pan

Step 2

In a large bowl, sift together the all-purpose flour, cake flour, baking powder and salt. Set aside.

Step 3

In a stand mixer or using a hand mixer, cream together the butter and cream cheese on medium speed until light and fluffy. Add the sugar and mix for 1 minute. Add the eggs, one at a time, and then the vanilla; mix for 1 minute, until well blended. With the mixer on low speed, slowly add in the dry ingredients and mix until completely blended.

Step 4

Pour the batter into the prepared loaf pan and bake until a toothpick inserted into the center comes out clean, 50 minutes. Let cool for 10 minutes before turning the cake out onto a wire rack to cool completely.