Whisk together malted milk powder, sugar and cornstarch in a medium size saucepan. Whisk in 1/2 cup half-and-half until mixture is smooth. Add remaining half-and-half and cook over medium heat, whisking constantly, until mixture thickens and begins to boil, 2 to 3 minutes.
Remove pan from heat and whisk in chocolate, until smooth. Whisk in vanilla. Spoon pudding into 4 dessert dishes. Serve warm, sprinkling each dish with some crushed malt candies. Or, if serving cold, scrape pudding into a large bowl, press a piece of plastic wrap onto pudding surface, and refrigerate for up to 1 day. Just before serving, divide pudding among 4 dessert dishes and sprinkle crushed malt candies on top.
Add 1/4 cup of cornstarch...
I haven't actually tried this yet but wanted to let the last reviewer know that according to the print version of this recipe in the January, 2009 issue of All You, you add 1/4 cup of cornstarch - hope this helps!