01 - Preheat oven to 350°F. Grease a 9x5-inch loaf pan and line with parchment paper, leaving an overhang on the long sides for easy removal.
02 - In a large mixing bowl, whisk together the flour, sugar, baking powder, baking soda, salt, and ground cinnamon until evenly distributed.
03 - In a separate bowl, whisk the eggs, whole milk, melted butter, and vanilla extract until smooth and well blended.
04 - Pour the wet mixture into the dry ingredients and stir gently 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 create an even surface.
06 - Bake on the center rack for 40 to 45 minutes, or until a toothpick inserted into the center comes out clean. The top should be golden brown.
07 - Let the loaf rest 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 the melted butter for the topping.
09 - Mix the sugar and cinnamon in a small bowl. Sprinkle the mixture over the buttered surfaces and gently pat it in to ensure an even, generous coating.
10 - Allow the loaf to cool completely on the wire rack before slicing into 8 even portions.