Step 1

Preheat the Oven: Preheat your oven to 350°F (175°C). Spray a 9x13-inch cake pan with nonstick baking spray.

Step 2

In a large bowl, whisk together the 1.1 gf flour or all purpose flour, baking powder, sugar, ground cinnamon, and salt.

Step 3

In a separate bowl, mix the vegetable oil, eggs, vanilla extract, and milk until smooth.

Step 4

Pour the wet ingredients into the dry ingredients, stirring until smooth.

Step 5

Set aside ½ cup of the cake batter for the cinnamon filling, then pour the remaining batter into the prepared cake pan.

Step 6

In a small bowl, combine the reserved ½ cup of cake batter with the brown sugar, ground cinnamon, and melted butter. Mix until smooth.

Step 7

Create the Swirl: Drop spoonfuls of the cinnamon filling mixture over the top of the cake batter. Use a butter knife to swirl the filling into the batter, creating a marbled effect.

Step 8

Bake the Cake: Bake for 35-40 minutes or until a toothpick inserted into the center comes out clean.

Step 9

Prepare the Glaze: In a mixing bowl, combine the powdered sugar and 5-6 tablespoons of milk, mixing until smooth.

Step 10

Glaze the Cake: Pour the glaze over the warm cake, gently spreading it with a spatula.

Step 11

Serve: This cake can be served warm or cold. Enjoy!