Put mini pie crusts in a 9x13 metal pan, layer pie crust with 3-4 banana slices. Put 2-3 mini peanut butter cups on top of bananas, top with several mini marshmallows. Cover 9x13 pan with aluminum foil and put on grate (tri-pod) over campfire for 10-15 minutes.
pds, I like those little graham cracker mini pie crusts. You can put almost anything in them for little desserts like cherry pie filling (etc.), pudding & whipped cream or fresh berries. Instant dessert.