Freezing cooked veggies and beans for example. Blanched and frozen veggies yes, canned cooked beans yes. There's a best method for each type of food. Sometimes blogs like these forgo the best methods for their own convenient methods.
Low fat mozzarella is going to be rubbery. More rubbery if you layer it thicker. I would look to a whole milk mozzarella or whole milk cheese. Don't go out and pay $11 a pound though, that's highway rubbery.