In a microwave-safe mug, combine the flour, sugar, baking powder, and cocoa powder. Stir well to ensure all dry ingredients are evenly mixed.
Pour in the milk and vegetable oil. Stir until the mixture is smooth and free of lumps.
Place the chocolate pieces in the center and gently press them into the batter for a gooey surprise.
Microwave the mug on high for 1 minute and 20 seconds to 1 minute and 40 seconds. The cake should rise and set but still be moist. Microwave times may vary, so keep an eye on it.
Let the mug cake cool for a minute or two, then enjoy it straight from the mug!
Notes
Choose Good Cocoa: Using a high-quality cocoa powder really boosts the flavor of your mug cake. If you can, go for a premium brand.Mix Well: Before adding the wet ingredients, make sure the dry ingredients are well-mixed. This helps the baking powder spread evenly, so your cake rises nicely.Smooth Batter: Stir the batter until it’s smooth and lump-free. This helps the cake cook evenly, giving it a better texture.Chocolate Tip: For a gooey center, press the chocolate pieces into the middle of the batter. If you like the chocolate spread throughout, just mix it in.Microwave Time: Microwaves vary, so start with 1 minute and 20 seconds. If the cake isn’t set, add 10 seconds at a time. Be careful not to overcook, or the cake might dry out.Check Doneness: The cake should rise and look set on top but still feel soft. It will keep cooking a bit after you take it out, so it’s okay if it’s slightly underdone.Let It Cool: Let your mug cake rest for a minute or two after microwaving. This helps the flavors come together and improves the texture.Customize: Have fun experimenting! Try adding a pinch of salt, a splash of vanilla, or even a bit of instant coffee for a mocha twist.