Make the Cookies:

1. Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
2. In a large bowl, beat the butter, cream cheese, and sugar together until light and fluffy. Add the egg, lemon juice, lemon zest, and vanilla extract, mixing until smooth.
3. In a separate bowl, whisk together the flour, baking powder, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until a soft dough forms.
4. Scoop 1.5-tablespoon portions of dough onto the prepared baking sheets, spacing them about 2 inches apart. Use the back of a spoon to slightly flatten the tops.
5. Bake for 10–12 minutes, or until the edges are set and the tops look slightly underbaked. Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

Make the Lemon Glaze:

1. In a small bowl, whisk together the powdered sugar, lemon juice, and lemon zest until smooth. Adjust the consistency by adding more powdered sugar for a thicker glaze or more lemon juice for a thinner glaze.

Glaze the Cookies:

1. Once the cookies are completely cooled, drizzle or spoon the glaze over the tops. Let the glaze set for about 15–20 minutes before serving.