Start by cutting a banana lengthwise through the top peel only. You don't want to cut all the way through, you want a pocket inside the banana inside the peel.
Carefully smoosh the ends of the banana together to open up a pocket inside of the banana in the banana peel.
Add your desired toppings, finishing with a nice layer of vegan marshmallows. Shove them in there so you get lots of them! Make sure the marshmallows are really in there. If they are outside of the banana too much they will just get stuck to the aluminum foil and you won't have any inside your banana boat when it's done.
Wrap in foil, making a little handle so you can grab it later with tongs, and set right on top of campfire coals.
If you have a raging campfire that's just too hot to cook right on the coals, you can put the banana boat packets on the grate instead.
Cook them for 5-10 minutes, depending upon the heat of your coals. Then carefully pull them out of the coals with tongs and open the foil pouch.
The marshmallow should be all melted and toasted, the chocolate melted, and banana soft and cooked.
Grab a spoon and dig in! Careful though, it's hot!
Notes
If you don't have a campfire, you can make these on a BBQ or in an oven. Just heat to 350˚F and cook the same way.