Combine peaches, eggs, milk, bran and vanilla; let stand 15 minutes.
Beat together sugar and butter until creamy. Stir in peach mixture.
Combine all-purpose and whole-wheat flour, baking powder, baking soda and spices.
Beat into peach mixture with a few light, rapid strokes, just until moistened.
Stir in nuts.
Spoon into well-greased 8-1/2-inch x 4-1/2-inch loaf pan.
Bake in 350° F oven 45 to 50 minutes or until toothpick inserted in center comes out clean.
Cool on wire rack before cutting.