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Preheat oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan.

In a large mixing bowl, cream the softened unsalted butter with an electric hand mixer until light and fluffy.

Add the vegetable oil, large eggs, and yellow cake mix to the bowl with the creamed butter. Mix with the electric hand mixer until the batter is smooth and a uniform yellow color, scraping down the sides of the bowl as needed.

In a separate small bowl, combine the packed light brown sugar and ground cinnamon. Stir until well mixed.

Pour approximately half of the prepared cake batter into the greased and floured baking pan. Use a spatula to spread the batter evenly across the bottom of the pan.

Evenly sprinkle the brown sugar and cinnamon mixture over the first layer of cake batter.

Scoop the remaining cake batter over the cinnamon layer, placing dollops of batter across the surface. Gently spread the remaining cake batter to cover the cinnamon mixture, being careful not to disturb the layer too much.

Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean.

While the cake is baking, prepare the glaze. In a clean bowl, combine the powdered sugar, milk, and vanilla extract. Whisk the glaze ingredients together until smooth and free of lumps.

Once the cake is baked, remove it from the oven. While it is still hot, use a wooden skewer or the handle of a spoon to poke numerous holes evenly across the entire top surface of the cake.

Pour the prepared glaze over the hot, poked cake. Use a spatula or the back of a spoon to gently spread the glaze evenly over the cake, ensuring it seeps into all the poked holes.

Allow the cake to cool completely in the pan before serving. This will allow the glaze to set and the cake to absorb the flavors.


Preheat oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan.

In a large mixing bowl, cream the softened unsalted butter with an electric hand mixer until light and fluffy.

Add the vegetable oil, large eggs, and yellow cake mix to the bowl with the creamed butter. Mix with the electric hand mixer until the batter is smooth and a uniform yellow color, scraping down the sides of the bowl as needed.

In a separate small bowl, combine the packed light brown sugar and ground cinnamon. Stir until well mixed.

Pour approximately half of the prepared cake batter into the greased and floured baking pan. Use a spatula to spread the batter evenly across the bottom of the pan.

Evenly sprinkle the brown sugar and cinnamon mixture over the first layer of cake batter.

Scoop the remaining cake batter over the cinnamon layer, placing dollops of batter across the surface. Gently spread the remaining cake batter to cover the cinnamon mixture, being careful not to disturb the layer too much.

Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean.

While the cake is baking, prepare the glaze. In a clean bowl, combine the powdered sugar, milk, and vanilla extract. Whisk the glaze ingredients together until smooth and free of lumps.

Once the cake is baked, remove it from the oven. While it is still hot, use a wooden skewer or the handle of a spoon to poke numerous holes evenly across the entire top surface of the cake.

Pour the prepared glaze over the hot, poked cake. Use a spatula or the back of a spoon to gently spread the glaze evenly over the cake, ensuring it seeps into all the poked holes.

Allow the cake to cool completely in the pan before serving. This will allow the glaze to set and the cake to absorb the flavors.
