Preheat oven to 350°F. Line or grease mini cupcake/muffin pan.
In a medium bowl, whisk together the egg, nutella and flour until blended.
Spoon batter into the cups about 1/3 full. Then add a dollop of nutella in the center of each. Cover with more batter, until the cakes are about 2/3 full. You can sprinkle with Christmas sprinkles, chopped chocolate, etc for decoration.
Bake about 9 minutes.
Notes
Recipe adapted from Abby Dodge's book Desserts 4 Today: Flavorful Desserts with Just Four Ingredients
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.