Step 1

Preheat the oven to 350 degrees Fahrenheit. Grease a tube pan generously with butter and lightly coat with flour. Shake off the excess flour.

Step 2

In a large bowl, combine the butter and shortening. Beat at medium speed for 4-8 minutes, or until the mixture is light and fluffy. Add the eggs, 1 by 1, beating after every addition.

Step 3

In a separate bowl, combine the baking powder, salt, flour, and sugar.

Step 4

Gradually pour the dry ingredients into the butter-egg mixture alternately with the milk, ending with the dry ingredients. Beat after every addition, until well-combined. Stir in the vanilla.

Step 5

Pour the batter into the greased pan. Bake for 1 to 1 1/2 hours, or until a toothpick inserted into the center of the cake comes out clean.

Step 6

Let the cake cool in the pan for 10 minutes. Flip it over onto a wire rack and allow it to cool completely.