Preparation Steps

• Preheat the oven to 350°F (175°C). Grease a 9x13 inch baking pan and set aside.
• In a medium bowl, whisk together the flour, baking powder, and salt. Set dry ingredients aside.
• In a large bowl, cream the softened butter with granulated sugar until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla.
• Alternate adding the dry ingredients and the milk to the butter mixture, beginning and ending with the dry ingredients. Mix until just combined.
• Spread about half of the batter evenly into the prepared pan.
• In a small bowl, combine the brown sugar and cinnamon for the swirl. Stir in the melted butter until crumbly.
• Sprinkle the cinnamon-sugar mixture evenly over the batter in the pan. Dollop the remaining batter on top and gently swirl with a knife to create a cinnamon ribbon.
• Bake in the preheated oven for 30 to 35 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
• While the cake cools slightly, whisk together the powdered sugar, milk, and vanilla to make a smooth glaze. Add more milk a drop at a time if needed to reach desired consistency.
• Drizzle the glaze over the warm cake. Allow to cool about 15 minutes before slicing and serving.