Ingredients
Method
- Stir flour, sugar, cocoa powder, and baking powder in a large microwave-safe mug.
- Stir in milk and oil until smooth with no dry streaks.
- Stir in crushed graham crackers and chocolate chips.
- Microwave on high for 60 to 90 seconds until the cake is just set in the center — it should still look slightly moist on top.
- Immediately pile mini marshmallows on top and microwave for another 10 to 15 seconds until marshmallows puff.
- Eat directly from the mug while warm.