Preheat oven to 350 degrees F.
Slice about 2 inches deep through the top of the French bread, and continue to cut a large rectangle, being careful not to cut through the bottom of the bread. Remove top of bread and hollow out middle to create more space. Set aside.
In a medium bowl, combine cream cheese, Greek yogurt, buffalo sauce, ½ cup of sharp cheddar cheese, chicken, garlic powder, and salt/pepper to taste.
Spoon the buffalo chicken dip into prepared French bread and top with remaining cheddar and green onions. Bake on a baking tray at 350 degrees F for 25-30 minutes or until cheese is melted and bread is golden, and slightly crispy.
Let bread sit for approximately 10 minutes and then slice. Best served warm.
Enjoy!