Preheat oven to 350°F or heat panini pan or grill to medium.

Place a chocolate bar, 2 marshmallows, and several banana slices on 1 piece of challah. Schmear another slice of challah with chocolate spread and sandwich both slices together.

Brown sandwiches (I like to place a pan on top to weigh down the panini and get the filling gooey and yummy) about 5 to 7 minutes.