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

In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.

In a separate large bowl, cream together the butter, granulated sugar, and brown sugar until light and fluffy, about 3-5 minutes.

Add in the lightly beaten egg and vanilla extract to the butter-sugar mixture and mix until fully combined.

Gradually incorporate the dry ingredients into the wet ingredients, stirring until just mixed.

Using a cookie scoop, drop spoonfuls of dough onto the lined baking sheet, leaving space between each mound.

Bake for 10-12 minutes until the edges are golden brown but the centers remain soft.

Press nine pastel M&Ms into each cookie as soon as they come out of the oven.

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