Terrible recipe. I made it three times and none were edible. All had hard strange pieces (malt powder?). Just a really bad recipe, down to telling me to use foil instead of parchment. I give up.
I am thinking either I did something wrong or there is a problem with this recipe. I have just made it twice in a row and both times I had the same issue. When I add the malted milk powder, even after sifting it, it clumps terribly when being mixed into the hot chocolate and never dissolves. I used KAF malted milk powder and carefully sifted each time but both resulted in small chewy masses of malted milk powder in the final product. If I were to attempt his again, I might try whisking the milk powder into a bit of hot water before adding it in.