As far as experiments go, this one was a moderate success. I wouldn't say complete for a few reasons. It's messy and it's only OKAY. I think, maybe, my proportions were off - the ratio of chocolate to peanut butter was too much when dealing with a stronger flavor (dark chocolate) to smooth peanut butter. And the banana was nearly drowned out completely.
Be prepared with many, many napkins...
2 pieces bread
2 tbsp butter (or as needed)
2-3 tbsp peanut butter
1-2 ounces chocolate, chopped
Cut diagonally and serve.
In a frying pan, melt 1 tbsp of the butter. Make sure butter does not burn. Slice the bananas into 1/4-inch thick slices. Spread the peanut butter on 1 slice of bread and place chopped chocolate on peanut butter. Cover with banana slices in a single layer and top with the remaining slice of bread. Spread the remaining butter on one side of the sandwich. Grill the sandwiches in the frying pan, unbuttered side first, until each side is golden brown and chocolate is melted.