Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan.
In a large mixing bowl, whisk together the flour, granulated sugar, baking powder, and salt.
In a separate bowl, combine the milk, eggs, vanilla extract, and melted butter. Mix well.
Gradually add the wet ingredients to the dry ingredients, stirring until just combined. Be careful not to overmix.
In a small bowl, mix together the softened butter, brown sugar, and ground cinnamon to create the cinnamon filling.
Pour half of the cake batter into the prepared baking pan. Spread the cinnamon filling evenly over the batter.
Drop spoonfuls of the remaining cake batter over the cinnamon filling, and use a knife or spatula to swirl the batter and filling together to create a marbled effect.
Place the baking pan in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
While the cake is baking, prepare the glaze by whisking together the powdered sugar, milk, and vanilla extract until smooth.
Once the cake is done, remove it from the oven and let it cool for a few minutes.
Drizzle the glaze over the warm cake, allowing it to soak in.
Slice and serve the Cinnamon Bun Cake warm or at room temperature.
Enjoy the delightful flavors of cinnamon buns in this easy-to-make Cinnamon Bun Cake. It’s a perfect treat for breakfast, brunch, or any time you’re in the mood for something sweet and comforting.
