Preheat your oven to 325°F (160°C) and grease and flour a loaf pan.

In a mixing bowl, beat together softened butter and cream cheese until smooth and fluffy (about 3 minutes).

Gradually add sugar while continuing to mix until light and airy. Add eggs one at a time, mixing well after each addition.

In another bowl, whisk together flour and baking powder. Slowly incorporate the dry ingredients into the wet mixture on low speed until just combined.

Add vanilla extract and mix gently until no dry flour remains.

Pour batter into the prepared loaf pan and bake for 60-70 minutes or until a toothpick inserted into the center comes out clean. Allow to cool in the pan for about ten minutes before transferring to a wire rack.