Use a microwave-safe mug around 10–12 ounces to leave enough room for the cake to rise.

Chocolate chips are optional and can be omitted or increased for a richer chocolate flavor.

For a creamy center, add a spoonful of peanut butter or another nut butter to the batter.

Try a small amount of peppermint extract or a pinch of instant espresso powder for a flavor variation.

Chopped nuts or caramel sauce can be added for extra texture and richness.

Serve warm with whipped cream, vanilla ice cream, fresh berries, or powdered sugar.

Dairy milk or unsweetened almond, oat, or soy milk can be used.

Avoid overcooking, which can make the mug cake rubbery or dry. Microwave wattages vary, so add extra cooking time in short intervals.

The cake is best enjoyed immediately. Leftovers can be covered and refrigerated for 1–2 days and reheated in 10–15 second intervals until just warm.