Step 1

Combine the butter, cream, and egg in a 12-ounce microwave-safe mug until well combined.

Step 2

Add the flour, sugar, and cocoa and stir until just combined. Be sure to scrape the sides and bottom of the mug so all of the dry ingredients are incorporated. Stir in the chocolate chips.

Step 3

This cake usually takes two minutes to cook in the microwave, but I recommend starting at one minute and checking it every 30 seconds until it’s fully cooked. The cake is done when the top is cooked, and the cake has started to pull away from the sides of the mug. The cake should spring back when you lightly press on the top.

Step 4

Remove the mug from the microwave and let it sit for a few minutes to cool. Serve it warm with the ice cream, if using.