Melt butter and marshmallows in a large glass bowl by sticking them in the microwave for about 1 minute.
Once you remove from microwave, begin to stir immediately with a large spoon to mix the marshmallows with the butter. Once it is is mixed, pour in the rice krispies. Stir until the rice krispies are evenly coated.
Add in the Nutella and stir until rice krispies are evenly coated with nutella.
Place the rice krispies into a 9 x 11 baking pan, pressing down to evenly distribute the treats across the pan. Let the rice krispies cool and set before cutting and serving.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.