Step 1

Combine the flour, sugar, cocoa powder, instant espresso, baking powder and salt in a 12-ounce microwave-safe mug. Stir well with a fork. Add the milk, vegetable oil and vanilla and stir until smooth, making sure there are no lumps of flour or cocoa in the bottom of the mug. Stir in the chocolate chips.

Step 2

Microwave on high for 1 minute 15 seconds to 1 minute 30 seconds, or until a toothpick inserted into the center comes out clean. (Make sure you don’t overcook the cake or it will be dry.) Let cool for 2 to 3 minutes, then top with whipped cream and chocolate-covered espresso beans.