I used a packet of Jay Robb chocolate whey protein in my mid-day shake. It made the shake taste even better. I like Jay Robb's products because they're 100% natural (he's been using stevia in his products for years). Almost as importantly, they usually taste really good. I don't use them often however because they tend to be quite expensive.
I've been kind of busy and preoccupied lately. When I feel that way, eating is the last thing I'm interested in. In fact, it almost feels like a chore. That's why I often make a shake, instead of a proper meal. Fortunately, I feel like I've come up with a genuinely healthy meal replacement. So I don't feel bad about utilizing it anytime that I need/want to. The added bonus is that it really does taste delicious to me.