Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

Whisk together the flour, baking powder, baking soda, and salt in a bowl until well combined.

In a large bowl, cream together the softened butter, granulated sugar, and brown sugar for 2-3 minutes.

Mix in the lightly beaten egg and vanilla extract into the creamed mixture until combined.

Fold the dry ingredient mixture into the wet mixture using a spatula until just combined.

Drop generous portions of dough onto the prepared baking sheet, leaving space between each.

Bake for 10-12 minutes until the edges are lightly browned and centers appear soft.

Press nine milk chocolate pastel M&Ms into the tops of each cookie while they are still warm.

Let the cookies cool on the baking sheet for about 5 minutes before transferring to a wire rack.