In a large mixing bowl, whisk together the flour, sugar, baking powder, salt, and cinnamon.

In a separate bowl, combine the vegetable oil, egg, and milk. Whisk until smooth.

Slowly pour the wet ingredients into the dry ingredients. Fold gently until just combined.

Fold in the chopped peaches and optional nuts into the batter.

Pour the batter into a greased 9x5-inch loaf pan. Bake at 350°F (175°C) for 60-75 minutes.

Let the bread cool in the pan for 10 minutes before transferring it to a wire rack.