Combine the oats, chia seeds, chocolate, maple syrup, vanilla, and coconut in a medium bowl. Toss until well combined. Add the peanut butter, and use your hands to really work the ingredients together. Adjust a bit if necessary, adding a bit more peanut butter if the mixture won't stay in a ball shape. Alternately, add more oats if the mixture is too sticky.
You can shape into balls by hand, but I find it is easier (and less messy) to press the mixture into a rounded tablespoon, then press it out (see photo). Arrange on a parchment lined baking sheet or plate, and refrigerate or freeze. Carry around in a small jar, or any small structured bento or container.