To a large pitcher, add coffee grounds and water. Add cinnamon and vanilla, then use a wooden spoon to stir to combine. The grounds will float to the top, so try to mix around the cinnamon as much as possible.

Let cold brew sit for at least 8 hours in the fridge (up to 24 for best flavor).

Place a fine mesh strainer or a thin tea towel over another pitcher or container. Carefully pour coffee mixture (grounds and all) through the strainer/towel. Set coffee ground aside (see post for uses) and strain a few more times. This will ensure you are able to get all of the grounds out cleanly. Alternatively, slowly pour cold brew through a paper coffee filter (this will take a bit longer but will provide a smooth result after one time. 

Your coffee is ready to drink! It will keep in the fridge for at least a week. It is fairly caffeinated, so feel free to mix with water or nondairy milk for a latte. I will normally mix ½ cup cold brew with ½-1 cup water or milk. Feel free to adjust to your preference.