Add the oats, sugar, cocoa powder, and instant coffee in two small bowls or jars. Add the remaining ingredients.
Cover the bowls/jars and refrigerate them for at least 4 hours or overnight.
When ready to enjoy, give the oats a mix and add more milk, if needed. Add some toppings and enjoy immediately.
Notes
TO STORE: Leftovers can be stored in the refrigerator, covered, for up to 5 days. TO MAKE AHEAD: Make a big batch of the oats in a Sunday night and have breakfast ready for every weekday.