Lightly grease a 9x13 baking pan and set aside.

In a large pot, melt the cubed butter over medium low heat until just melted. Add in the marshmallow and stir frequently with a wooden spoon. Melt until only a few minor lumps remain.

Remove from heat and add in the entire box of Strawberry Cheerios and mix well with your spoon until the marshmallow is evenly distributed.

Spread the mixture into your greased pan. Be careful not to push the cereal down too much or your bars won't have that light and airy texture!

Let the bars set for 1 to 2 hours before slicing. When ready to serve, slice the bars into 12 (or more) even pieces.

Place the Nutella in a small bowl and heat in the microwave for 15-30 seconds or until smooth.

Drizzle the Nutella over the bars using a piping bag or a spoon! Enjoy!