Empty the contents of a condensed milk can into a saucepan,, set on medium heat and bring it to simmer, stirring occasionally.
Add diced chocolate and stir until dissolved. Stir in non-alcoholic whiskey if using.
Add coffee and vanilla extract. Stir until combined. Simmer gently on low heat for about 2 minutes, stirring regularly.
Add cream and stir until combined (use a whisk for better results), take off the heat.
Leave the drink to cool down and transfer into a clean bottle. Keep refrigerated and consume within 7 days of making this product. Shake the bottle before serving if the mocktail splits.
Notes
Possible swaps (1:1 ratio unless stated otherwise):
Evaporated milk,
Single cream,
2 tablespoon cocoa powder instead of dark chocolate – add to a hot coffee, before adding to the condensed/evaporated milk,
No or low alcohol bourbon (whisky) or other liquor (rum).
Tip: Add less cream/coffee to reach desired consistency if using alcohol-free whiskey or other liquor. See more tips and storage advice in the article above this recipe.