Heat the oven to 325°F.
In a large bowl, combine the mashed bananas, eggs and oil. In a separate bowl, combine your dry ingredients (flour, sugar, pudding mix, baking soda and salt). Add the dry ingredients to the wet ingredients and mix until just combined.
Grease your Bundt pan. Pour the batter into the pan. (This can also make two 8- by 4-inch loaves, if you don't have a bundt pan)
Bake until the cake springs back when lightly pressed and a toothpick inserted in the center comes out clean, 60 to 80 minutes. Start testing at 50 minutes— mine took 70 minutes. Let it cool slightly in the pan, then use a butter knife to gently release the cake from the sides of the pan and around the inner circle, then flip it onto a plate.
Allow to cool, then serve warm with salted butter, nutella, or both!