Cook the chicken by boiling in a large pot of water for approximately 25 minutes, then remove from the pot and allow to rest until cool enough to handle.

Preheat the oven to 350 degrees F and spray a 9x9-inch baking pan with non-stick cooking spray.

In a medium saucepot over medium-low heat, combine cream cheese, ranch dressing, hot sauce, black pepper, and garlic powder. Whisk until the cream cheese is dissolved.

Add the cooked and shredded chicken, green onion, 1 cup of mozzarella cheese, and 1 cup of cheddar cheese to the sauce pot. Mix well and transfer to the prepared baking pan. Top with remaining mozzarella and cheddar cheese.

Bake for approximately 20-30 minutes, or until the cheese melts and sides bubble. Set oven to BROIL for an additional 2-3 minutes, or until the top is golden brown. Remove immediately.

Serve with tortilla chips, vegetable sticks, crackers, or in a tortilla with greens.