star cooking up a success story. >> it's ro, withal come to another nerdy nummies. >> reporter: rosanna has more than 9 million youtube subscr e subscrib subscriber. we caught up with her on her road trip across america promoting her new line of kitchen tools. >> it feels surreal. it was the only word i can think to describe it. >> reporter: fans waiting in line to get their hands on aprons, mixing bowls, cookie cutters and sprinkles. >> this is the first time i've done a baking line. there's so much work that goes into it. >> reporter: you built a physical business out of a virtual business. >> i knew it was possible to have a career online and make a living creating content full time, but i didn't know that that was going to happen for me. >> she's amazing. >> reporter: why? >> she's like the coolest person in the world. >> just so fun to watch her.