preheat oven to 350F
cream together 1/2 cup softened butter + 2/3 cup granulated sugar + 1 tsp vanilla + 1 tbsp powdered sugar
mix in zest from 1 lemon + juice from 1/2 a lemon (save the other half for the icing)
whisk in 1 egg just until combined
stir in 1 1/2 cup all purpose flour + 1 tsp baking powder + 1/2 tsp baking soda
scoop on a lined baking sheet (makes 12 cookies)
bake for 12-14 min or until edges are golden
icing: juice from 1/2 a lemon + 1 cup powdered sugar