The movement has been happening for so long. Plant based milks are sweeping through our kitchens and grocery store aisles. First it was soy milk, and then almond milk soon stole the spotlight. Now the latest big thing in the non-dairy milk category is oat milk. It's a hot ticket item at places like Costco and Trader Joe's, and is projected to explode in popularity over the next few years. Studio 5 Health Contributor Miki Eberhardt shared the low down on all the options out there if you're wondering which is best for you.