Protein shakes
I'm 4.5 years out...I still do shakes, but early out, I discovered unflavored Whey protein isolate, (regular whey does me in!) sugar free syrups and flavor extracts ( I never did much baking after Home Ec in high school, so I never really had a need for extracts until now).
I also use cold decaf hazelnut coffee to make my favorite iced coffee protein shake. The beans come already flavored, so I just grind some up, brew it, put it in a half gallon jug in the fridge, and use it for my shakes.
Saves money, and tastes great!