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Preheat the oven to 350° F and grease a standard loaf pan with cooking spray or line with parchment paper. Set aside.
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Cream together the sugar and butter until smooth. Then, beat in the mashed bananas, eggs, and vanilla. In a separate bowl, combine the dry ingredients (flour, baking soda, salt), and then stir into the banana mixture until combined. Fold in the chocolate chips and Reese's Peanut Butter Baking Chips.
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Pour the batter into the loaf pan, and bake for 30 minutes. Then, cover the loaf with a loose tent of aluminum foil, and continue to bake for another 30-40 minutes, until a toothpick comes out clean (the aluminum foil is to prevent your banana bread from browning too much on the top!)
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While the banana bread is cooling, make the marshmallow fluff (you can also use pre-made marshmallow fluff from the store, it will need to be heated in order to spread on top). Add 20 jumbo marshmallows and 2 tbsp light corn syrup to a medium saucepan and heat on medium heat, until the marshmallows start to melt, stirring every so often. Once the marshmallows are fully melted, spread it on top of the cooling banana bread. Melt 1/2 cup of peanut butter in a microwave-safe dish for about 30 seconds, or until melted. Drizzle over the bread on top of the marshmallow layer. Allow the banana bread to cool for about 45 minutes before cutting and serving. Enjoy!