Butter the bread slices on 1 side
with butter and place them butter side down. Spread 4
slices with peanut butter and top with the banana
slices. Spread the remaining slices with jelly and put
them, jelly side down, on top of the bananas. Press them
gently to flatten them slightly.
Place each sandwich on a preheated panini press and
grill until the bread is toasted, about 5 minutes.
Alternately, preheat a dry cast iron or non stick pan.
Place the sandwich in the pan and weight it down with
another pan or a clean brick wrapped in foil. Grill 5
minutes, turn the sandwich over, re-weight it, and grill
for another 5 minutes. Serve immediately.