Chocolate Mug Cake

Step 1

Microwave the butter in a microwave-safe mug in 10-second increments until melted, 20 to 30 seconds. Crack the egg into a small bowl; add the vanilla and whisk to combine using a small whisk or fork. Pour the egg mixture into the mug over the butter and whisk to combine.

Step 2

Add the sugar, cocoa powder and salt and whisk until mostly smooth (a few lumps are O.K.). Scrape down the sides the best you can with a spoon or a small silicone spatula. Sprinkle with mini chocolate chips, if desired.

Step 3

Cook in the microwave on high for 1 to 1 1/2 minutes, or until a toothpick inserted in the center comes out mostly clean. Sift a little confectioners’ sugar on top or serve with a scoop of vanilla ice cream, if desired. Dig in with a spoon.