By the same methods one would use to make any kind of cannabis-infused edible. To make a CBD-rich brownie or another CBD-rich edible, one must first extract oil from a CBD-rich strain and infuse it into olive or coconut oil or butter or ghee (clarified butter). These infused oils or butters are the most common ways to cook with cannabis. One will need to combine the CBD-rich plant material (usually the leafy trim) with the oil or butter and expose to low heat over a long period of time – this will help to avoid breakdown and/or vaporization of the CBD and other cannabinoids. After straining out the plant material, one can substitute CBD-rich cannabutter or canna-oil into your favorite recipes. There are many extraction recipes and tutorials available on-line, including, for example, the Cannabis Chef.