Place the parchment paper inside your baking dish
Press 3/4 of the sugar cookie dough into the baking pan
Spread the marshmallow cream over the sugar cookie (using about 1/2 of the container)
Sprinkle 1.5 cups of white chocolate chips over the marshmallow cream
Start layering the pretty Peeps over the white chocolate chips
Press the last 1/4 of the sugar cookie dough around the outside of the Peeps dish (giving it a cookie border).
Bake for 20 minutes or until the dough is cooked through and the peeps have a light brown shade of sugar on top
Let cool
Remove the entire sheet by pulling up the parchment paper out of the baking dish
Cut into bars
Serve on a plate, with a fork, and a big glass of ice cold milk