• 1 tablespoon unsalted butter, softened, plus extra for greasing mug
• 3 tablespoons brown sugar
• 3 tablespoons all-purpose flour
• 2 tablespoons cocoa
• 1 teaspoon instant coffee granules
• Pinch salt
• Pinch baking soda
• 5 tablespoons water
• ¼ teaspoon vanilla extract
• 2 tablespoons bittersweet chocolate chips (or 1 ounce chopped)
• Ice cream or whipped cream to serve on top

Step 1
Butter inside of a mug. Add 1 tablespoon butter, brown sugar, flour, cocoa, instant coffee, salt, baking soda, water, vanilla, and chips to the mug. Stir until completely combined.

Step 2
Wipe inside rim of cup to remove excess batter. Microwave on High power until cake has risen and looks moist (not wet) on top, checking every 30 seconds, about 1 to 2 minutes. Avoid overcooking or it will be dry. Let rest to cool briefly before topping with ice cream and eating.