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

In a large bowl, whisk together the flour, sugar, baking powder, and salt until well combined.

In a separate medium bowl, whisk together the eggs, milk, melted butter, and vanilla extract until smooth.

Pour the wet ingredients into the dry ingredients and mix using a spatula until just combined. Do not overmix; a few streaks of flour are acceptable.

Gently fold in the floured blueberries and the diced peaches until evenly distributed throughout the batter.

Pour the batter evenly into the prepared loaf pan. Optionally, sprinkle the top with a tablespoon of coarse sugar for a crunchy crust.

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

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