01 - Preheat oven to 350°F. Grease and flour a 9-inch round cake pan or line with parchment paper.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl.
03 - Beat butter and sugar in a large bowl until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in yogurt or sour cream, lemon zest, lemon juice, and vanilla extract.
05 - Gradually add dry ingredients to wet mixture, alternating with milk, beginning and ending with flour. Mix until just combined.
06 - Toss blueberries with 1 tablespoon flour, then gently fold into batter.
07 - Transfer batter to prepared pan and smooth top evenly.
08 - Bake for 38-42 minutes until a toothpick inserted in center emerges clean.
09 - Let cake rest in pan for 15 minutes, then transfer to wire rack to cool completely.
10 - Combine powdered sugar and lemon juice until smooth. Drizzle over cooled cake.