Preheat your oven to 350°F and prepare a 9” Bundt pan.
Cream butter and sugar, then incorporate eggs, sour cream, and vanilla. Mix in dry ingredients and fold in blueberries.
Pour half the batter into the pan, sprinkle with a mix of brown sugar, cinnamon, and pecans, then top with the remaining batter.
Swirl the layers together, bake for 55-60 minutes, and let cool.
Invert onto a plate and dust with confectioners’ sugar before serving.
