Add all of the sauce ingredients to a medium saucepan over medium-high heat, stirring frequently until boiling.
Reduce heat to medium low and simmer for 2 to 3 minutes. Remove from heat and allow to cool for several minutes.
Dry Rubbed Chicken
While the sauce is cooling, preheat oven to 350°F and prepare the chicken.
Cover the chicken breasts with plastic wrap or parchment paper and flatten them until they are approximately ½-inch thick. Apply ½ teaspoon kosher salt per pound of meat on all sides.
Combine the remaining rub ingredients in a small bowl, and apply evenly over the chicken.
Heat a large, cast iron or stainless steel skillet over medium high heat, and add 2 to 3 tablespoons of neutral cooking oil.
Add the chicken, and cook chicken breasts until done, flipping frequently. Cook for approximately 15 to 18 minutes until done, or an instant read thermometer registers 165°F in the thickest part of the chicken.
Transfer the chicken to a medium sized bowl and allow to cool several minutes. Use two forks to shred the chicken into bite sized pieces, and toss in the prepared buffalo sauce.
Assembly and Topping
Add ½ cup blue cheese, sour cream, cream cheese, ¾ cup of the cheddar, ¾ cup of mozzarella, and two of the of the sliced green onions to a large skillet. Stir to combine.
Top with remaining cheddar, and low-moisture mozzarella and bake for 25 minutes until bubbly.
Garnish with remaining blue cheese, sliced green onion, and serve warm with tortilla chips, crackers, or any other dip-delivery device!