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Preheat the oven to 350°F. Line two baking sheets with parchment paper.
In a large mixing bowl, beat the butter and sugar for 2-3 minutes until creamy and light. Stop and scrape the bottom and sides of the bowl.
Add the eggs and vanilla, mixing until combined.
Add the flour, cornstarch, baking soda, and salt. Stir on medium-low speed until combined and only a few streaks of flour remain.
Stir in the white chocolate chips and Lucky Charms marshmallows and cereal pieces on low speed or by hand until evenly dispersed.
Use a medium cookie scoop to place balls of cookie dough on the prepared baking sheets, spacing them a few inches apart so they have room to spread while they bake.
Bake for 10-12 minutes until set around the edges. Immediately press a few extra marshmallow pieces into each of the warm cookies right after removing them from the oven.
Let set up for 5 to 10 minutes on the baking sheet before transferring to a cooling rack.