Using a small mixing bowl, whisk together the flour, cocoa powder, and sugar.
Pour the dry ingredients into a 12-ounce microwave-safe mug sprayed with non-stick cooking spray.
Make a “well” into the center of the flour mixture.
Pour in the milk, vegetable oil, and vanilla. Stir until the mixture is well combined and somewhat smooth.
Sprinkle in the chocolate chips.
Microwave the cake batter for 70-75 seconds, depending on your microwave's wattage.
Notes
Storage:The cake is a single serving and does not reheat well.Tips:
Using a wider and shorter cup for this works best and makes it easier to scoop out your cake.
You can substitute all-purpose flour for self-rising flour. Add a ¼ teaspoon of baking powder.
Keep a close eye on the cake while it’s in the microwave and cook it until the center is just set. Depending on your microwave's wattage, cooking times may vary.
You can substitute mini chocolate chips for regular chocolate chips.
Double the recipe to share this rich cake with a friend. Microwave cakes one at a time if you are making more than one.