01 -
Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
02 -
In a large bowl, whisk together flour, sugar, baking powder, cinnamon, and salt until well combined.
03 -
Melt the butter in a microwave-safe bowl; let it cool slightly before adding to the dry ingredients. Mix in eggs one at a time along with vanilla extract until just combined.
04 -
Pour the batter into the prepared dish and spread evenly. For the cinnamon swirl topping, mix melted butter with sugar and cinnamon until crumbly; sprinkle over the batter.
05 -
Bake for 25-30 minutes or until golden brown and a toothpick inserted comes out clean.
06 -
Let cool completely before frosting with cream cheese icing made from powdered sugar and milk.