Step 1

Add the chocolate chips, coffee, vanilla, and corn syrup to a microwave-safe bowl.

Step 2

Melt the chocolate mixture together in the microwave. Heat for 30 seconds and stir and then heat in 10-second increments and stir until it is fully melted and smooth. Let the chocolate mixture cool, but not harden.

Step 3

Mix the butter, sugar, cocoa powder, and salt in the bowl of your stand mixer with the paddle on high speed for about 1 minute until light and fluffy. You can also use a large bowl and an electric mixer if you prefer.

Step 4

Add the cooled chocolate mixture to the butter mixture and mix until it is smooth and fluffy. The desired consistency of the frosting will be different depending on the temperature. If it is too stiff, warm it up slightly in the microwave and stir. If it is too soft let it sit in the refrigerator for a few minutes to set up.

Step 5

The frosting can be used immediately to frost a cake or put into a piping bag for decorations.

Step 6

Cover it with plastic wrap and stored it at room temperature for 3 days. If you plan to keep it longer, keep it in an airtight container in the refrigerator or freezer.