Lucky Charms Cookies

0 Line cookie sheet with parchment paper and set aside.
1 In a separate bowl, whisk the flour, cereal, baking soda and salt until well combined.
2 In a large bowl mix sugar and butter in medium-high speed, around 1 minute. Scrape the bottom of the bowl and add egg and egg yolk and vanilla. Mix until just combined.
3 Add the dry ingredients to the wet ingredients, mixing until just incorporated. Do not over mix your dough!
4 Fold in the marshmallows into the batter using a spatula. 
5 Scoop the dough with a large cookie scoop (3 tablespoons) to form evenly sized dough balls. Place them in a cookie sheet, cover them with plastic wrap and refrigerate for at least 1 hour.
6 Pre-heat oven to 350 Fahrenheit and place the chilled lucky charms cookie dough into the prepared baking sheets, 2.5 inches apart from each other.
7 Bake lucky charms cookies for 10-15 minutes, or until the edges start to turn a light golden brown, one cookie tray at a time. Remove from the oven and immediately add a few extra marshmallows on top of the cookies for garnish. Let the cookies cool for around 5 minutes in the cookie sheets, then transfer to a cooling rack to cool completely.