Step 1: Preheat your oven to 350°F (175°C) and grease a 9×5-inch loaf pan.
Step 2: In a large mixing bowl, whisk together the all-purpose flour, 1 cup granulated sugar, baking powder, salt, and 1 teaspoon ground cinnamon until well combined.
Step 3: In a separate bowl, whisk together the 1/2 cup melted butter, egg, milk, and vanilla extract until smooth.
Step 4: Pour the wet ingredients into the dry ingredients and gently stir until just combined. Be careful not to overmix; a few lumps are okay.
Step 5: Pour the batter into the prepared loaf pan, smoothing the top with a spatula.
Step 6: Place the loaf pan in the preheated oven and bake for 50-60 minutes, or until a toothpick inserted in the center comes out clean.
Step 7: While the bread is baking, combine the 1/4 cup granulated sugar and 1 tablespoon ground cinnamon for the topping in a small bowl.
Step 8: Once the bread is done baking, remove it from the oven and let it cool in the pan for about 10 minutes. Then, brush the top with the 2 tablespoons melted butter and sprinkle the cinnamon sugar mixture generously over the top.
Step 9: Allow the bread to cool in the pan for another 10 minutes before transferring it to a wire rack to cool completely. Slice and enjoy!