Originally Posted by Cat Herder:
Beef spaghetti sauce, black bean salsa, brown gravy, cheese sauces, etc. Just toss them into a coffee grinder, first. They make a great thickener and can even be added to smoothies that way. 
This is genius. Thank you! Especially the cheese sauce. I make a sauce with fake vegan cheese, so there is no fat or protein in it. I am forever trying to find ways to add healthy fats I to those types of dishes and I just never put two and two together.