Place two jars on the counter and fill each with ½ cup oats, 1 teaspoon cocoa powder, 2 teaspoons peanut butter, ¼ teaspoon vanilla, 1 teaspoon of honey (if using), and ¾ cup milk. With a spoon, stir to combine well and cover with a lid.
Refrigerate for 8 hours or overnight.
In the morning, stir to combine, and enjoy cold or warmed in the microwave for 30 seconds to 1 minute.