Put the cocoa into a small pot (off the cooktop) and add about a tablespoon or two of the milk to whisk into a paste, then add the remaining milk and continue whisking. I use this mini-whisk from OXO as it's perfect for jobs like this.
Place the pot over medium heat and continue to whisk; add the broken chocolate. Keep whisking until the chocolate has melted.
Next, add the sugar and stir.
Continue to whisk the mixture while adding the corn starch, before the hot chocolate comes to a boil.
Turn up the heat and whisk briskly to keep the mixture smooth. As soon as it comes to a boil, remove from the heat and pour into a mug. Serve immediately.
Notes
Adjust the sugar to your liking and add more or less corn starch to suit your degree of how thick the hot chocolate is.
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