Preheat your oven to 350°F
In a small bowl, toss the blueberries with 1 tablespoon of flour until evenly coated. This helps prevent them from sinking to the bottom of the cake. Set aside
In a large mixing bowl, whisk together the dry ingredients: flour, baking powder, baking soda, and salt. Set aside
In another large mixing bowl, beat the butter and sugar for 4-5 minutes until light and fluffy
Mix in the eggs one at a time, ensuring each is fully incorporated before adding the next. Then, stir in the vanilla extract
Add the oil and mix until combined
Gradually add the dry ingredients, alternating with the sour cream, mixing in small amounts at a time. This keeps the batter smooth and prevents over mixing
Gently fold in the blueberries using a spatula to avoid breaking them
Spray a 10-inch bundt pan generously with nonstick cooking spray. Pour the batter into the pan and spread it evenly
Bake at 350°F for 50-65 minutes, or until a toothpick inserted into the center comes out clean. If the top starts browning too much, loosely cover the cake with foil for the last 5-10 minutes
Remove from the oven and let the cake cool in the pan for about 10-15 minutes before flipping it onto a cooling rack. Once completely cooled, transfer it to a serving platter.