Preheat oven to 350°F (175°C). Grease and flour a 9x5 inch loaf pan.

In a large bowl, whisk together the flour, granulated sugar, baking soda, cinnamon, and salt. Make a well in the center of the dry ingredients.

In a separate medium bowl, combine the mashed peaches, melted butter, beaten egg, milk, and vanilla extract. Whisk until well combined.

Pour the wet ingredients into the well of the dry ingredients. Stir until just combined, being careful not to overmix. A few lumps are okay.

Pour the batter into the prepared loaf pan and spread evenly. Sprinkle the top with turbinado sugar, if desired.

Bake for 50-60 minutes, or until a wooden skewer inserted into the center comes out clean. If the top begins to brown too quickly, loosely tent with aluminum foil.

Let the bread cool in the pan for 10-15 minutes before transferring it to a wire rack to cool completely.