1. Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan.
2. In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. This is a crucial step to ensure all dry ingredients are evenly distributed.
3. In a large bowl, cream the butter and sugar together until light and fluffy, about 3-4 minutes. This was always my favorite part as a child, watching the mixture transform.
4. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
5. Gradually add the flour mixture to the butter mixture, alternating with the sour cream, beginning and ending with the flour. Mix just until combined.
6. Gently fold in the blueberries, being careful not to overmix, to avoid crushing them.
7. In a small bowl, mix together the brown sugar and cinnamon. Sprinkle half of this mixture into the bottom of the prepared pan.
8. Spoon the batter into the pan and smooth the top with a spatula. Sprinkle the remaining cinnamon sugar mixture on top.
9. Bake for 40-45 minutes, or until a toothpick inserted into the center comes out clean. Let cool in the pan for 10 minutes before transferring to a wire rack to cool completely.

Baking this cake reminds me of the patience I learned in the kitchen as a child—waiting for the perfect moment when the aroma signals it’s time to gather around the table.