In a large bowl, whisk together the flour, baking powder, baking soda, and salt; set aside.

In a medium bowl, using a hand mixer, beat together the butter and sugars until light and fluffy. Add the eggs and vanilla extract, beat until well combined.

With mixer on low speed, add the dry ingredients to the wet ingredients, beat until combined. Stir in 1 cup M&M’s candies. Cover the dough with plastic wrap and refrigerate for 1 hour up to 3 days.

Preheat oven to 375 degrees. Line cookie sheets with parchment paper.

Take the dough out of the refrigerator and let it sit for about 10 minutes so that you can work with it.

Drop cookie dough by rounded tablespoonful onto prepared cookie sheets (8 per sheet). Place a few M&Ms on the tops and sides of the dough balls.

Bake the cookies for 9-11 minutes. They will look very soft and under baked in the centers. Remove from the oven and immediately decorate with more M&M’s.

Let the cookies cool on the sheets for 10 minutes; remove to a wire rack to cool completely.