- Preheat your oven to 350°F. Line two baking sheets with parchment paper. 
- In a medium bowl, whisk together the flour, baking soda, baking powder, and salt. Set aside. 
- In a large bowl, cream together the softened butter and granulated sugar until light and fluffy, about 2-3 minutes. 
- Add the egg, lemon zest, lemon juice, and vanilla extract, mixing until well combined. 
- Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix. 
- Using a cookie scoop or tablespoon, portion out the dough and roll each piece into a ball. Roll the balls in powdered sugar until fully coated. 
- Place the dough balls on the prepared baking sheets, spacing them about 2 inches apart. 
- Bake for 10-12 minutes, or until the edges are lightly golden. The centers may look slightly underbaked; they will firm up as they cool. 
- Allow the cookies to cool on the baking sheets for 5 minutes before transferring them to a wire rack to cool completely.