Cookie Lover’s Red Velvet Bars

box (15.25 – 18.25 oz) Red Velvet cake mix

vegetable oil

eggs, slightly beaten

OREO cookies, coarsely chopped

snack-size Hershey’s Cookies ‘n’ Creme Bars, broken into pieces

box (4 oz.) Chocolate Chip Cookie Dough Bites

sweetened condensed milk