Preheat the oven to 350°F (175°C). Grease a loaf pan.

In a mixing bowl, cream together the butter and sugar until light and fluffy.

Add the eggs one at a time, beating well after each addition.

Stir in the vanilla extract.

In another bowl, whisk together the flour and baking powder.

Gradually add the dry ingredients to the wet ingredients, alternating with the milk.

Fold in the pistachios.

Pour the batter into the prepared loaf pan and bake for 40 minutes or until a toothpick inserted into the center comes out clean.