Thanks to Joe, I can make a warm, comforting, decadent-tasting mug of hot cocoa and feel very little guilt about it.
Trader Joe's Cocoa Powder Unsweetened is the only cocoa powder I've come across that isn't "processed with alkali" and that contains literally nothing but cocoa powder. At 20 calories per tablespoon and one gram of fat, this fine, silky cocoa powder feels almost healthful to me, in that it's likely delivering the benefits of chocolate without all the saturated fat and sugar.

For homemade hot cocoa, I just pour milk (usually 2%) into a mug, heat it in the microwave for 2 minutes or so, then add a couple of heaping teaspoons of the cocoa powder. I stir a LOT and for a LONG time to fully blend the powder into the milk and break up most of the little lumps. Then I add sugar to taste, usually not much more than a teaspoon or so, because I like bitterness.
And that's it! I make it for my kids, too, of course, and they enjoy it. (Don't get me wrong---they'll suck down that Swiss Miss crap just as fast, but they certainly don't turn up their noses at the homemade stuff.)
I should mention that I haven't used this cocoa powder for baking, much, mostly because I don't bake chocolate cakes and the like all that often. My friend and mother-in-law, Lala, did use it for brownies the last time she visited us, and oh my, those brownies did
not disappoint! They were perfectly rich and chocolatey. Mmmm.