Heat oven to 350°F. Combine cream cheese, yogurt, Cheddar, half the blue cheese, and hot sauce in a medium bowl; stir until smooth. Fold in chicken and 1/2 of the green onions. Spoon the mixture into a baking dish. Sprinkle over remaining blue cheese and green onions. Bake until hot and bubbly, about 15 minutes. Serve with vegetables.