Indulge in a delightful birthday cake-inspired cookie that brings the festive flavors of a celebration into every bite. This treat features soft, birthday cake-flavored cookie dough generously studded with creamy white chocolate chips and vibrant rainbow jimmies. As a sweet surprise, mini marshmallows are folded into the dough, melting slightly during baking to create pockets of gooey goodness. The result is a chewy, colorful cookie that captures the essence of a birthday party, making every day feel like a special occasion.