Nutella Chocolate Cheerios Treats

Work is having a party tomorrow. They will provide chicken and salad and we bring side dishes or desserts. And because they love their contests, we will vote on the best dishes. (insert eye roll)
I thought about making chocolate crinkles or even bourbon balls. Those are too much work for such a big crowd. There may be lots of dishes and not enough for everyone to get a taste.
Yesterday, I got a large jar of Nutella with the idea of baking with it. I looked in Paprika for some idea and came across a Rice Krispies Treats with Nutella and pecans. I did not have Rice Krispies nor pecans and didn’t want to face the crowds at the grocery store. I did have Chocolate Cheerios and modified a recipe for Peanut Butter Rice Krispies Treats. 

6 cups Chocolate Cheerios
10 oz mini marshmallows
4 tablespoons butter
1/2 cup Nutella

In a large bowl, melt butter in the microwave
Coat 13x9 pan with cooking spray, also spray on large spatula
Add marshmallows and coat with melted butter
Microwave on high for 45 seconds, stir
Microwave for 45 seconds
Add Nutella to the bowl and stir to blend
Add Cheerios to the bowl, completely coat the Cheerios
Pour mixture into 13x9 pan.
Use the sprayed spatula to flatten mixture into pan. Allow to cool before cutting into squares.