Preheat the oven to 375°F (190°C).
In a large mixing bowl, whisk together the all-purpose flour, baking powder, salt, and sugar until well combined.
Add the whole milk and melted unsalted butter to the dry ingredients.
Stir the mixture with a wooden spoon or spatula until just combined and a sticky dough forms. Do not overmix.
Transfer the dough to a greased 8×4-inch loaf pan and spread it evenly.
Bake in the preheated oven for 25 minutes or until the top is golden brown and a toothpick inserted into the center comes out clean.
Remove the bread from the oven and let it cool in the pan for 10 minutes.
Turn the bread out onto a wire rack to cool completely before slicing.