Makes 1 loaf
Inspired by Joan’s on Third
1 1/2 cups flour
Preheat oven to 325 F. Lightly grease and flour a 9 x 5 inch loaf pan and set aside.
Mix flour, baking powder and salt together in a bowl and set aside.
In the bowl of an electric mixer fitted with the paddle attachment, beat the butter and sugar at medium-high speed until light and fluffy. Scrape down the bowl, lower speed to medium and add in the eggs and vanilla until fully incorporated. In 3 batches, add in the flour mixture, mixing at low speed after each addition until just blended.
Spread 1/3 of the batter in the pan, then spread 1/3 of the Nutella on top. Repeat with another third of the batter and another 1/3 of the Nutella. Top with the remaining batter and Nutella and lightly swirl the Nutella and batter together with a knife.
Bake until a toothpick inserted in the center comes out clean, about 1 hour 15 minutes. Allow the cake cool in the pan for 15 minutes. Remove cake from pan and allow to cool completely on a wire rack for about 2 hours. Store well wrapped at room temperature.