Preheat the oven to 325°F (163°C). Grease and flour a 9×5-inch loaf pan.

In a large mixing bowl, cream the butter and cream cheese together until smooth and fluffy.

Add the sugar and beat until light and creamy.

Mix in the eggs, one at a time, followed by the vanilla extract.

In a separate bowl, whisk together the flour, baking powder, and salt.

Gradually add the dry ingredients to the wet ingredients, mixing just until combined.

Pour the batter into the prepared pan and smooth the top.

Bake for 60-70 minutes, or until a toothpick inserted into the center comes out clean.

Allow the cake to cool in the pan for 15 minutes before transferring it to a wire rack to cool completely.