Preheat the oven to 400°F. Chop the 16 oz rotisserie chicken small.
Mix the chicken, 1-½ cups cottage cheese, 1 cup buffalo sauce, ½ cup plain Greek yogurt, 1 packet ranch seasoning, and 1 can white beans until combined. Either do this in a large bowl, or split each ingredient four ways and mix directly in four oven-safe meal prep containers.
If you mixed in a bowl, divide the mixture evenly between four oven-safe containers (or spread into one baking dish and portion after baking).
Top each container with ¼ cup of the 1 cup cheddar cheese.
Bake, lids off, for 15 minutes until bubbly.
If your containers are rated for it (check the temperature rating first — ours are safe to 450°F without lids), broil for a couple of minutes until the cheese is golden. Watch it closely.
Let cool, then lid up and refrigerate. Serve with celery, carrots, or tortilla chips, in a wrap, or with a fried egg on top.