Preheat your oven to 350°F (175°C) and prepare a muffin tin by lining it with paper liners or greasing it with butter.

In a medium bowl, combine all-purpose flour, baking powder, baking soda, and salt. Mix thoroughly.

In a large bowl, beat together softened unsalted butter and granulated sugar until light and fluffy.

Add softened cream cheese to the butter and sugar mixture and beat until smooth.

Mix in egg, vanilla extract, lemon zest, and fresh lemon juice until well combined.

Gradually add the dry ingredients to the wet mixture, alternating with milk, mixing until just combined.

Fill each muffin tin cavity about two-thirds full with the batter.

Bake for 18-20 minutes until lightly golden and a toothpick comes out clean.

Let cool in the pan for about 5 minutes before transferring to a wire rack to cool completely.