Jalapeno Popper Chicken Casserole

Name: Jalapeno Popper Chicken Casserole
Ingredients: 6 oz. cream cheese, softened; 3/4 cup sour cream; 3/4 cup milk; 3 1/2 to 4 cups shredded cooked chicken (from 1 purchased roasted chicken); 1 1/2 ½ cups shredded mild cheddar cheese, divided (6 oz.); 6 jalapeño peppers, seeded and chopped; 4 green onions, sliced, divided (1/2 cup); 1/2 lb. bacon, crisp cooked, divided (about 8 slices); 1 tsp. garlic powder; 1 tsp. onion powder; 16 to 20 oz. frozen fried potato nuggets (1/2 of a 32-oz. bag)