01 - Preheat 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 butter and sugar together until light and fluffy, approximately 3 minutes.
04 - Add eggs one at a time, beating thoroughly after each addition until fully incorporated.
05 - Mix in yogurt (or sour cream), lemon zest, lemon juice, and vanilla extract until smooth.
06 - Gradually add dry ingredients to wet mixture, alternating with milk, beginning and ending with flour. Mix until just combined.
07 - Toss blueberries with 1 tablespoon flour to coat, preventing them from sinking to the bottom.
08 - Gently fold coated blueberries into the batter, taking care not to overmix.
09 - Pour batter into prepared pan and smooth the top evenly with a spatula.
10 - Bake for 38-42 minutes or until a toothpick inserted in the center comes out clean.
11 - Let cake cool in the pan for 15 minutes, then transfer to a wire rack to cool completely.
12 - Whisk together powdered sugar and lemon juice until smooth and pourable consistency is reached.
13 - Drizzle glaze evenly over the cooled cake. Allow glaze to set before slicing.