01 - Preheat the oven to 350°F (175°C). Grease a 9×5-inch loaf pan and line it with parchment paper, leaving an overhang on the long sides for easy removal.
02 - In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, baking soda, salt, and ground cinnamon until evenly distributed.
03 - In a separate bowl, whisk the eggs, whole milk, melted and cooled butter, and vanilla extract until smooth and well incorporated.
04 - Pour the wet mixture into the dry ingredients and gently fold with a spatula until just combined. Avoid overmixing to keep the crumb tender.
05 - Scrape the batter into the prepared loaf pan and smooth the top with a spatula to ensure an even surface.
06 - Bake on the center rack for 40–45 minutes, or until a toothpick inserted into the center comes out clean and the top is golden brown.
07 - Let the loaf cool in the pan for 10 minutes, then use the parchment overhang to lift it out and transfer to a wire rack.
08 - While the loaf is still warm, brush the top and all sides generously with melted butter using a pastry brush.
09 - In a small bowl, mix the granulated sugar and ground cinnamon for the topping. Sprinkle the mixture evenly over the buttered loaf and gently pat it onto the sides to ensure full, even coverage.
10 - Allow the loaf to cool completely on the wire rack before slicing into 8 even portions. Serve at room temperature.