These soft and tangy cookies are topped with a creamy pink lemonade frosting. Cream butter and sugar, mix in egg, sour cream, and vanilla. Add flour, baking powder, and salt. Chill the dough, then scoop and bake until golden. Whip up a fluffy frosting with a hint of pink lemonade Kool-Aid® mix. Frost the cooled cookies, add a sprinkle of lemon zest, and indulge in the refreshing flavors of these delightful treats!