Preheat oven to 375F and grease a 9x13 cake pan.
In a medium size mixing bowl whisk together flour, baking powder, and salt. Set aside.
In a large mixing bowl beat together butter and sugar until combined.
Add eggs and vanilla extract and continue beating until light and fluffy.
Pour milk and 1/4 cup lemon juice into batter and mix until combined.
Slowly add dry ingredients to wet ingredients and mix until just combined.
In a small bowl toss blueberries with two tsp. flour then gently fold into cake batter.
Pour batter into prepared baking pan and bake in a preheated oven for 25-30 minutes or until a toothpick comes out clean when inserted.
While cake is baking, prepare glaze by whisking together powdered sugar and lemon juice.
Remove cake from the oven and allow to cool completely.
Drizzle glaze over cooled cake, garnish with fresh blueberries if desired before serving. Enjoy!