Preheat oven to 350 degrees.

In a large bowl cream the butter and sugar together.

Add egg and beat in well.

Add lemon juice, lemon zest and vanilla extract  and mix until well blended.

Add salt, baking powder and flour and mix until well incorporated.

Roll cookies into 1 inche balls and place dough balls about 2 inches apart from each other.

Bake at 350 degrees for 8-10 minutes or until lightly golden brown on the edges of cookie.

Combined glaze ingredients in a medium bowl and whisk until smooth glaze is formed drizzle as much as desired.