Preheat oven to 325°F and grease a bundt or loaf pan thoroughly.

Cream butter and sugar until light and fluffy. Add eggs one at a time.

Whisk flour, baking powder, and salt. Add to batter alternately with buttermilk.

Stir in vanilla, then gently fold in diced peaches.

Pour batter into pan and bake until golden and a toothpick comes out clean.