Cheap, easy, nutritious, and filling soup to take to work every day?

I have a tiny fridge so I need something I can put in my chest freezer and microwave portions of it to put in a thermos. I’m hoping for minimal prep work, though I have a Vitamix if that helps. I already eat the same thing every day, that I buy from work for 6 dollars. Not ideal. I’m thinking I can bring the soup and some...