In a large bowl, blend brown sugar, flour, salt, ginger, and baking powder with a fork. Use a mixer to blend in cookie butter, eggs, and vanilla extract until dough is smooth (dough will be thick).
Pour granulated sugar and powdered sugar into separate bowls. Roll cookie dough into 1" balls with your hands. Roll dough balls in granulated sugar first; then, roll in powdered sugar until well-covered. Place dough balls 2" apart on a silicone-lined cookie sheet.