Ooey, gooey, chocolate goodness! The combination of sweet chocolate, gooey marshmallows and crispy rice will make a family pleasing dessert!
Preheat oven to 350 degrees. Prepare a 15x10x1 baking sheet by lining it with foil and spraying the foil with non-stick spray.
In a small bowl, mix the butter and sugar together until it’s just combined. Add in the eggs, mixing between each addition. Then, add in the vanilla and mix until combined.
In another bowl,whisk together the flour, cocoa powder and salt. Slowly add it to the wet ingredients and mix until well combined. Spread the batter into the prepared pan and bake for 15-18 minutes.
Once the cake is done cooking, immediately spread the marshmallow fluff all over the top. The heat will help the fluff spread. Cool for about 30 minutes.
Spoon or scoop the topping onto the fluff layer and carefully spread it all over the top. Move kind of quickly as the topping will harden up if not spread quickly.
Chill in the fridge until the top is set. Cut into bars and serve! Store in an airtight container at room temperature.