Everything Bagel Sandwich Casserole

Name: Everything Bagel Sandwich Casserole
Ingredients: Cooking spray; 7 large eggs; 2 1/2 cups half-and-half; 1/2 teaspoon kosher salt; 1/4 teaspoon black pepper; 2 teaspoon everything bagel seasoning , divided; 6 everything bagels , cut into 1-inch chunks (about 14 cups total); 8 ounces sharp Cheddar cheese, shredded (about 2 cups); 5 thick-cut bacon slices , cooked and crumbled; 1 bunch scallions , sliced, plus more for garnish; 1 ( 8 - ounce ) package cream cheese , cut into 1/2-inch cubes