Chicken Bacon Ranch Tater Tot Casserole

Name: Chicken Bacon Ranch Tater Tot Casserole
Ingredients: Cooking spray; 1 (32 ounce) package frozen potato tots (about 6 1/2 cups) (such as Ore-Ida Crispy Tater Tots); 1 (10.5 ounce) can cream of chicken soup (such as Campbell’s); 1 cup sour cream; 2/3 cup ranch dressing; 1 (1 ounce) envelope ranch dressing mix; 1/2 teaspoon cracked black pepper; 1/2 teaspoon granulated garlic; 5 cups shredded rotisserie chicken (from 1 [3-lb.] chicken); 4 ounces sharp Cheddar cheese, shredded (about 1 cup); 1 1/4 cups cooked and crumbled bacon (from 10 slices), divided; Sliced scallions