Preheat your oven to 350°F (175°C), then grease and flour a 9x5 inch loaf pan to prepare it for baking.
In a large bowl, cream together the softened butter and sugar until the mixture is light and fluffy.
Beat in the eggs one at a time, ensuring each is fully incorporated before adding the next.
Mixing
In a separate bowl, whisk together the flour and baking powder, then gradually add this dry mixture to the wet ingredients, alternating with the milk, mixing until just combined.
Gently fold in the diced peaches to evenly distribute them throughout the batter.
Baking
Pour the batter into the prepared loaf pan and bake for 60-70 minutes, or until a wooden skewer inserted into the center comes out clean.
Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.
Notes
For an extra touch, you can sprinkle some cinnamon sugar on top of the cake before baking.