Step 1

Preheat the oven to 350 degrees Fahrenheit (175°C). Grease a 9x13-inch baking pan with butter or non-stick spray.

Step 2

In a large bowl, beat together the yellow cake mix, instant pudding, water, eggs, and oil with an electric mixer at medium speed for 8 minutes. Mix in butter extract and vanilla. Pour half of the batter into the greased pan.

Step 3

Combine the cinnamon and sugar and sprinkle half of it over the batter. Pour the remaining batter on top, followed by the remaining cinnamon sugar. Swirl the batter with a knife (optional).

Step 4

Bake for 30 to 35 minutes, or until a toothpick inserted into the center comes out clean.

Step 5

While the cake is baking, make the glaze. Whisk together powdered sugar, hot milk, butter flavor extract, and vanilla until well combined.

Step 6

Pour the glaze while the cake is still warm. Serve warm, and enjoy!