01 - Preheat the oven to 350°F. Grease and line a 9x5-inch loaf pan with parchment paper.
02 - Whisk together flour, baking powder, and salt in a medium bowl; set aside.
03 - In a large bowl, cream butter and sugar until light and fluffy, about 2 to 3 minutes.
04 - Beat in eggs one at a time, mixing well after each addition, then stir in vanilla extract.
05 - Add half of the dry ingredients to the wet mixture and stir gently. Pour in half the milk and mix. Repeat with remaining dry ingredients and milk until just combined.
06 - Pour batter into prepared loaf pan and smooth the surface evenly.
07 - Combine topping sugar and optional cinnamon; sprinkle evenly over the batter.
08 - Bake for 50 to 55 minutes or until a toothpick inserted in the center comes out clean.
09 - Allow to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.