Preheat your oven to 350 degrees Fahrenheit and grease a 9x5 inch loaf pan with butter or cooking spray.

In a medium bowl, whisk together 2 cups flour, 1 and 1/2 teaspoons baking powder, and 1/2 teaspoon salt until well combined.

In a large bowl, beat 1/2 cup softened unsalted butter and 1 cup granulated sugar on medium speed for 2 to 3 minutes until light and fluffy.

Add 2 large eggs one at a time, mixing after each addition, then stir in 1 teaspoon vanilla extract until combined.

Alternately add the flour mixture and 1/2 cup milk in three additions, beginning and ending with the flour, mixing gently after each addition until just combined.

In a small bowl, combine 1/4 cup granulated sugar, 1 tablespoon brown sugar, and 2 teaspoons ground cinnamon; have 3 tablespoons melted butter ready.

Pour half of the batter into the prepared pan, drizzle with half of the melted butter, and sprinkle half of the cinnamon sugar mixture over the top.

Top with the remaining batter, drizzle with the remaining butter, sprinkle the rest of the cinnamon sugar, and swirl gently with a knife.

Bake at 350 degrees Fahrenheit for 50 to 55 minutes until the top is golden and a toothpick inserted comes out with a few moist crumbs.

Let the bread cool in the pan for 10 minutes, then remove and cool completely on a wire rack before slicing.