In a small saucepan whisk together heavy cream and malted milk powder; bring to a boil over medium-high heat.
Place both chocolates in a medium heatproof bowl. Pour boiling cream over chocolate and let stand until melted, about 1 minute. Using an immersion blender, blend until smooth. Let stand at least 6 hours and up to overnight before using.
OK, the ganache looked fantastic when I first made it. I let it set as directed, now it's rock hard. Can I heat it again to soften?
I would like to see the amounts of chocolate by weight, not by measurement. There can be a big difference in amounts using chopped chocolate since the degree of chopping varies greatly.