Line 3 loaf pans with parchment paper and spray with non-stick spray. Alternatively, you can use a 16 cup tube pan.
In a small bowl, mix flour, baking powder, and salt. Set aside.
Measure out buttermilk in a measuring cup and add vanilla to it.
In a large bowl, cream sugar and butter together until fluffy.
Add eggs, one at a time, until completely incorporated.
Add flour mixture in thirds, alternating with buttermilk mixture until all combined.
Pour into prepared pans.
Put in oven cold and turn to 325°
Bake for 65-75 minutes or until toothpick comes out clean