- 5 minutes
In a bowl, beat together the butter, sugar, Nutella, and heavy cream.
Add the flour, baking powder, and salt. Then add the cocoa. Mix until smooth.
Press the brownie batter into a 12-inch cast iron skillet.
Sprinkle the chocolate chips over the batter.
Bake in a 350-degree oven for 25 to 30 minutes.
Fill the skillet with marshmallows (on end) and continue baking until the marshmallows get pretty (don't broil them!). This may take several minutes. Keep a close eye on them as they bake.