Kids' Favorite Chicken Noodle Casserole

Ingredients

• 12 oz. wide egg noodles
• Kosher salt & freshly ground black pepper
• 1 medium onions, chopped fine
• 3 Tbs. all-purpose flour
• 2½ cups half-and-half
• 2½ cups low-sodium chicken broth
• 1 lb. boneless, skinless chicken breasts, halved lengthwise and trimmed
• 4 oz. deli American cheese, coarsely chopped
• 4 oz. sharp cheddar cheese, shredded (about 1 cup)
• 1½ cups frozen peas
• 25 Ritz crackers, crushed coarse