Sift the flour into a large bowl. Add the baking powder, salt, and vanilla sugar, then mix well.
Cut the cold butter into small cubes and add it to the flour. Using your fingertips, rub the butter into the flour until the mixture resembles coarse crumbs.
In a separate bowl, thoroughly mix the peanut butter and powdered sugar. Add the egg and mix until smooth.
Add the peanut butter mixture and sour cream to the flour mixture. Gently and quickly bring the dough together. Be careful not to over-knead, as this will make the scones tough.
Wrap the dough in plastic wrap and refrigerate for at least 30 minutes to allow the flavors to meld.
On a lightly floured surface, roll the chilled dough to a thickness of about 1.5 cm (approximately 1/2 inch). Use a scone 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 them cool slightly. Serve dusted with powdered sugar or spread with peanut butter. They are delicious both fresh and warm!
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