01 - Preheat your oven to 350°F. Grease and flour a 9-inch round cake pan or line with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt until well blended.
03 - In a large bowl, beat the butter and sugar together until light and fluffy, about 3 minutes.
04 - Add the eggs one at a time, beating well after each addition. Mix in yogurt (or sour cream), lemon zest, lemon juice, and vanilla extract until incorporated.
05 - Gradually add the dry ingredients to the wet mixture, alternating with the milk, beginning and ending with flour. Mix until just combined, being careful not to overmix.
06 - Toss the blueberries with 1 tablespoon flour to prevent sinking, then gently fold them into the batter.
07 - Pour the batter into the prepared pan and smooth the top. Bake for 38-42 minutes or until a toothpick inserted in the center comes out clean.
08 - Let the cake cool in the pan for 15 minutes, then transfer to a wire rack to cool completely.
09 - Mix powdered sugar and lemon juice until smooth and drizzleable. Adjust consistency with more lemon juice if needed.
10 - Drizzle the glaze over the completely cooled cake. Let set for 15 minutes before slicing and serving.