1In large bowl, cream butter and sugar until light and fluffy. Add the eggs one at a time, beating well after each addition. Beat in milk, lemon juice, and zest. Combine the flour, baking powder and salt; add to the creamed mixture until just moistened. Fold in the blueberries gently.
Fill paper lined muffin cups 3/4 full. Bake at 400 degrees for 23-30 minutes or toothpick inserted comes out clean. Cool for about 5 minutes before removing to a wire rack.
In a small bowl, combine the confectioners sugar, lemon juice, butter and vanilla; drizzle over warm muffins. Enjoy!!!