I add about two teaspoons of ‘Coffee Mate’ powdered creamer to Cambells Tomato Soup - makes it so creamy and levels the tartness - add a bit of garlic powder - salt pepper and a clump of butter - Delicious!
When out of flour for gravey or thickening sauces - use Bisquick instead - only smaller amounts.
Potato starch - or even instant potato flakes - are good for thickening soups/sauces, too.
I use a tablespoon of medium salsa cooked for a minute or two in 2 teaspoons of butter. Then add the soup etc... I’ll try the coffee mate thing - sounds like it would add depth. Thanks.