Carefully chop the Terry's Chocolate Orange into small pieces. Set aside.
In a small bowl, mix the cornstarch with a couple of tablespoons of milk to create a smooth paste. Ensure there are no lumps.
In a saucepan, combine the milk and double cream. Heat the mixture over medium heat until it begins to simmer, but do not let it boil.
Add the chopped Terry's Chocolate Orange pieces to the simmering milk and cream mixture. Stir continuously until the chocolate is completely melted and the mixture is smooth.
Gradually whisk in the cornstarch paste into the hot chocolate mixture. Continue stirring until the hot chocolate thickens to your desired consistency.
Sprinkle the chocolate powder into the hot chocolate and stir well to combine.
Once the hot chocolate has thickened and is well mixed, remove it from the heat.
Garnish with additional chopped chocolate or a dollop of whipped cream if desired.
Pour the hot chocolate into mugs and enjoy your delicious Terry's Chocolate Orange hot chocolate!
