Milo is my childhood fave and my go-to, Valrhona makes the most reputable "fancy" cocoa powder so I would assume their hot chocolate mix would also be rly good too, I also like to pre-make a bunch ahead of time and store it in tins / jars so it's ready to go! Toasted milk powder is a great addition.

So cute ~ We have tons of native big leaf maple, hazels, and willows that need to be pruned and even thinned to keep the forest healthy (right now it's just a giant fire hazard due to being mismanaged for years) so it's a great way to utilize some of the material!