Chocolate Cinnamon Swirl Coffee Cake

Preheat oven to 350ºF. Use butter or cooking spray to grease and and then lightly flour a bundt pan. Set it aside.

With an electric mixer, beat together cake mix with water, vegetable oil, whole eggs, egg yolk, flour, and vanilla until batter is smooth. Set aside.

In a separate bowl, mix together brown sugar, cinnamon, cocoa powder, and espresso powder.

Pour 1/3 of the batter into the bundt pan. Sprinkle half of the cocoa sugar mixture over the batter. Pour another 1/3 of batter over the cocoa sugar mixture. Sprinkle the other half of the cocoa sugar mixture and then pour the remainder of the batter to cover.

Use a knife to swirl the batter and sugar mixture by inserting the knife into the cake and turning the knife before pulling up. Repeat all the way around the cake.

Bake the cake for 40–45 minutes or until a toothpick inserted into the center of the cake comes out clean. Remove from the oven and let the cake cool before turning it out.