Preheat your oven to 375 degrees and spray a muffin tin with cooking spray.
In a medium bowl, mix together the chicken, 2/3 cup of mozzarella, buffalo sauce, scallions, and blue cheese.
Pull apart the biscuits and flatten them to four inch rounds. Push each one into 8 of the muffin holes, pressing them firmly in. About 1/4 of inch of the dough will stick out.
Distribute the chicken mixture into each of the eight cups.
Top with the remaining mozzarella and bake for about 12 minutes or until the edges of the biscuit are golden brown.