Nutella + Eggs + Flour = Fudgy Nutella Cake - Beat 1½ cups Nutella with 4 large eggs in a large bowl until well combined and slightly increased in volume, about 2 minutes. Fold in the ½ cup all-purpose flour until combined. Scrape into a greased and parchment-lined 8-inch pan and bake at 350º F until the center is just set, 35 to 40 minutes. Let cool in the pan for 10 minutes, then cool on a wire rack until room temperature. Frost with ½ cup Nutella, and serve.