Preheat your oven to 350°F (175°C) and grease a 9x5-inch loaf pan.
In a large mixing bowl, whisk together the flour, 1 cup of sugar, baking powder, salt, and 1 teaspoon of cinnamon until well combined.
In another bowl, mix the melted butter, milk, eggs, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and stir until just combined. Do not overmix; a few lumps are okay.
Pour the batter into the prepared loaf pan and smooth the top.
In a small bowl, combine the 1/4 cup sugar and 1 tablespoon cinnamon for the topping. Sprinkle this mixture evenly over the batter.
Bake in the preheated oven for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.