Heat your oven to 200ºF and place a sheet pan on the middle rack.
Using the bread, peanut butter, and sliced banana, prepare four peanut butter and banana sandwiches.
In a large shallow dish or baking pan, whisk together the eggs, milk, cream, vanilla extract, maple syrup, cinnamon, and salt. Scatter the crispy rice cereal into a separate shallow dish and set aside.
Heat a large skillet over medium heat and, working with one at a time, add the sandwiches into the custard mixture to soak for 20 seconds per side. Once soaked, press the sandwiches into the cereal, flipping once so that each side is well coated. When ready to fry, melt a bit of butter in the pan along with a splash of oil. Cook the cereal-coated French toast sandwiches two at a time until golden brown on each side.
Place the French toast on the baking sheet in the oven to keep warm until ready to serve. Serve with maple syrup.