Creating checkboxes for a single product

Hi there. I'm creating a website for a friend. One of her products is a box of 6 cookies. She wants her customers to be able to click on multiple options (different flavors) for each cookie on the product page. So far I've only been able to select one flavor per product. I'm not sure how to do this but I've added a screenshot from a website with something similar to what I'm looking for. Can anyone help me figure this out?

@TTEss I am following this as I'm looking for a similar solution. Did you have any luck?