Step 1

Place the heavy cream and butter into a small saucepan. Place over medium-low heat and cook until the butter is melted, about 3 minutes, stirring occasionally.

Step 2

Add the brown sugar, granulated sugar, cocoa powder, corn syrup, instant coffee, and salt, whisk until everything is smooth and combined, about 3 minutes.

Step 3

Add in the chocolate chips and let them melt.

Step 4

Cook for 10 minutes, whisking constantly until thickened. The mixture should coat the back of a spoon and not be runny.

Step 5

Take off the heat and mix in the vanilla.

Step 6

Let cool for 10 minutes before serving.