In a large bowl, mix together sour cream, oil, vanilla, salt, and powdered sugar.
Add flour and baking powder, and knead gently with your hands until you get a soft and smooth dough texture.
Form the dough into a ball and place it in a medium-sized bowl and cover it with plastic wrap. Let the dough rest in the fridge for 30 minutes.
Preheat the oven to 340°F/170°C. Cover a baking sheet with parchment paper.
Divide the dough into 3 parts and roll each part into a rectangle about 9" long and 6" wide.
Spread about 1/3 of the chocolate spread on each rectangle in an even and thin layer. Roll into tight rolls and place on the prepared baking sheet. Bake the rolls for about 30-35 minutes or until they are golden.
Cool completely and slice into cookies with a serrated knife to get 1-inch thick slices. Sprinkle generously with powdered sugar and enjoy. Store these cookies in an airtight container at room temperature for up to a week.