Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper or a silicone baking mat.

In a bowl, whisk together the flour, baking powder, baking soda, and salt. Set this mixture aside.

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

Add the eggs one at a time, mixing well after each addition. Then stir in the vanilla extract.

Gradually add the dry flour mixture to the butter-sugar mixture, alternating with buttermilk. Begin and end with the flour mixture. Mix until just combined.

Scoop about 1 tablespoon of dough for each cookie and place them on the prepared baking sheet, leaving enough space between each scoop to allow for spreading.

Bake the cookies in the preheated oven for 10-12 minutes, or until the edges turn a light golden brown.

While the cookies are baking, prepare the glaze by whisking together the powdered sugar, milk, and vanilla extract in a small bowl until smooth.

Once the cookies are done baking, allow them to cool on the baking sheet for a few minutes before transferring them to a wire rack.

Drizzle the glaze over the cooled cookies. Let the glaze set before serving.