Preheat your oven to 350°F (175°C) and grease an 8x4-inch loaf pan.

In a large bowl, whisk together all-purpose flour, granulated sugar, baking powder, and kosher salt.

In another bowl, mix whole milk, large egg, melted butter, and vanilla extract until smooth.

Pour the wet ingredients into the dry ingredients, stirring gently until just combined.

Transfer the batter into the prepared pan, smoothing the top with a spatula.

In a small bowl, mix melted butter, granulated sugar, ground cinnamon, and ground nutmeg for the coating.

Drizzle the spiced sugar mixture evenly over the batter in the loaf pan.

Bake for 40-45 minutes, until golden brown and a toothpick comes out clean.

Allow to cool in the pan for about 10 minutes before transferring to a wire rack.