S'mores Bars

I had a big bag of S'mores Cereal that I needed to use up.  So decided to use that instead of rice Krispies....and S'mores Bars were born.

S'mores Bars
6 T. butter, melted
21 oz. bag of marshmallows  (7 cups mini)

7 to 8 c. S'mores Cereal (start with 7, use more if needed)
2 Hershey's chocolate bars, broken into pieces 

Spray a 9 x 13 inch baking dish.  

Melt butter in a large glass bowl in the microwave (about 30 seconds).  Stir in marshmallows and microwave for 1 minute.  Continue to stir and microwave for 1 minute intervals until melted.   Stir in cereal and spread into sprayed baking dish.  Top with the broken candy bar pieces.