Chocolate Filling won’t thicken

This is my recipe. I cup sugar, I cup hot water, 2 heaping tablespoons powdered baking chocolate, 2 heaping tablespoons cornstarch. Mix together, add hot water over medium/high heat, keep stirring until thickened, add tsp butter at the end. Put in the fridge to cool and thicken. This goes in between 2 chocolate cake layers. It always ends up running out of the cake. HELP!!

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2 Comments

Nancy
Nancy October 7, 2021
Another thought.
If this recipe always turns out runny, maybe the problem is with it and not with your technique.
Perhaps look for a tested, reliable recipe that is thicker and more spreadable. Something like a ganache, with more chocolate and less liquid/dairy.
 
Happygoin
Happygoin October 6, 2021
Are you bringing your mixture to a full boil? In order for cornstarch to thicken properly, it needs to come to a full boil. When it does, let it boil for 15-30 seconds or so. Stir it constantly with a wooden spoon or spatula so it doesn’t stick to the bottom of your pan. I hope this helps.
 
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