Scalloped Potatoes and Spinach

1 (10 3/4 ounce) can condensed cream of celery soup 1 (8 ounce) package spreadable cheese with garlic and herbs (such as Rondele) 1 1/4 cups milk 1 (16 ounce)[...]

2 lbs potatoes , peeled and cut into 1/8 inch thick slices 1 1/4 cups 1% low-fat milk 1 cup reduced-sodium fat-free chicken broth 3 tablespoons all-purpose[...]