Nutella is a sweet chocolate-flavored hazelnut spread made by Italian company Ferrero. The creamy spread is most often used on bread, but its unique flavor lends it to plenty of recipes. For example, you can make an easy Nutella cake by using boxed yellow cake mix. It requires only a few minutes of preparation, and the outcome takes cake mix to a whole new level. Nutella cakes are traditionally baked in bundt cake pans, but you can substitute two 9-inch round pans or one 13-inch by-9-inch baking dish.
Whisk together 2/3 cup Nutella and one egg until well-blended and smooth.
In a separate bowl, mix together the cake mix, three eggs, 1/3 cup Nutella and 1/2 cup buttermilk. Mix thoroughly for two to three minutes.
Remove 1 cup of cake batter and combine with the Nutella-egg mixture. Mix until thoroughly combined.
Pour the batter into the cake pan.
Spoon dollops of the Nutella batter on top of the yellow batter. Swirl the the two batters together with a knife, creating a marble effect.
Bake in a preheated 350 degree F oven until moist crumbs stick to a toothpick, or about 40 to 50 minutes.
Allow the cake to cool for 10 minutes, then remove from pan and place on a plate to cool completely.
Sprinkle the cake with powdered sugar. If you prefer to make a glaze, mix sugar with a few tablespoons of water and pour on top of the cook.