Sift the flour into a large bowl. Add the baking powder, salt, and vanilla sugar, and mix well.
Cut the cold butter into small cubes and add it to the flour mixture. Using your fingertips or a pastry blender, quickly rub the butter into the flour until the mixture resembles coarse crumbs.
Mash the bananas with a fork until smooth. Add the powdered sugar and the egg, and mix thoroughly.
Add the banana mixture and sour cream to the flour mixture. Quickly mix to form a dough. Be careful not to overmix, as this will make the scones tough.
Wrap the dough in plastic wrap and chill in the refrigerator for at least 30 minutes to allow the flavors to meld.
On a lightly floured surface, roll the dough out to a thickness of about 1/2 inch (1.5 cm). Use a round cookie cutter to cut out the scones.
Place the scones on a baking sheet lined with parchment paper. Bake in a preheated oven at 350°F (180°C) for 12-15 minutes, or until golden brown.
Let cool slightly before serving. Dust with powdered sugar, if desired. Enjoy fresh or warm!
To provide the best experiences, we and our partners use technologies like cookies to store and/or access device information. Consenting to these technologies will allow us and our partners to process personal data such as browsing behavior or unique IDs on this site and show (non-) personalized ads. Not consenting or withdrawing consent, may adversely affect certain features and functions.
Click below to consent to the above or make granular choices. Your choices will be applied to this site only. You can change your settings at any time, including withdrawing your consent, by using the toggles on the Cookie Policy, or by clicking on the manage consent button at the bottom of the screen.