Combine the oats, coffee, chia seeds, plant milk, maple syrup, and 1 tablespoon of cocoa powder in a large glass container. Stir thoroughly and refrigerate overnight.
In the morning, take the oats out of the fridge and stir them well. Split the oats between two jars, then add 1/2 cup of vanilla yogurt and 1 tablespoon of cocoa powder to each jar.