Preparation

Step 1: Preheat the Oven

Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with butter or non-stick spray and set it aside.

Step 2: Prepare the Cake Batter

1. In a large mixing bowl, whisk together the flour, sugar, salt, and baking powder.
2. Add the milk, eggs, and vanilla extract, and mix until combined.
3. Slowly pour in the melted butter and continue mixing until the batter is smooth.

Step 3: Pour the Batter

1. Pour the cake batter into the prepared 9×13-inch baking dish and spread it evenly using a spatula.

Step 4: Make the Cinnamon Swirl

1. In a separate bowl, mix softened butter, brown sugar, flour, and cinnamon until well combined.
2. Drop spoonfuls of this mixture evenly over the cake batter.
3. Use a knife or a skewer to swirl the cinnamon mixture into the cake batter, creating a marbled effect.

Step 5: Bake the Cake

1. Place the baking dish in the preheated oven and bake for 35-40 minutes, or until a toothpick inserted in the center comes out clean.

Step 6: Prepare the Glaze

1. While the cake is baking, prepare the glaze by whisking together powdered sugar, milk, and vanilla extract in a small bowl until smooth.

Step 7: Glaze the Cake

1. Once the cake is done baking, remove it from the oven and let it cool for about 10 minutes.
2. Drizzle the vanilla glaze over the warm cake to allow it to soak in slightly.