Oat Groats to Oat Milk. Still, when comparing oat milk to cow’s milk, oat milk … Oat milk requires more processing, thus more energy than its dairy alternative. Oat milk is a greener alternative to regular cow’s milk. You can also sprout oat groats, but this would take even more time. The method to make the least expensive oat milk at home involves soaking oat groats overnight. Making your oat milk is super easy – you just need a blender (Picture: Getty Images/Tetra images RF) There are loads (truly, so, so many) of recipes online and in … Oat milk is expected to grab more market share from other plant-based milk substitutes and be more successful at attracting dairy drinkers, D.A. Davidson analyst Brian Holland said in … The investment in Oatly is led by BlackStone Growth.Other investors in the Swedish oat-based milk startup include Oprah Winfrey, Roc Nation, … Davidson analyst Brian Holland said in … If you want to save money, you have to typically invest more time. Oat milk is expected to grab more market share from other plant-based milk substitutes and be more successful at attracting dairy drinkers, D.A. However, oat milk does not come without its impact on the environment.