Divide the dry rolled oats, cocoa powder, and salt between two pint-sized mason jars or similarly sized containers.
Divide the milk, coffee, and sweetener between the two jars. Mix until combined.
Let rest overnight or for at least 4 hours before enjoying.
Enjoy topped with fresh raspberries, chopped almonds, and bittersweet chocolate.
Video
Notes
Coffee: I usually use fresh brewed coffee but leftover cold coffee also works. You can also use cold brew. Mocha-flavored iced coffee and other flavored coffees are also delicious here.
Milk: I usually use vanilla soy milk but unsweetened and unflavored milk also works. Chocolate milk would be really good too.
Chocolate: I usually chop up ¼ ounce of dark chocolate baking chocolate but any kind of semisweet or dark chocolate chip work as well.