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S'mores Chocolate Mug Cake

When that late-night dessert craving hits, this S’mores Chocolate Mug Cake is the ultimate solution. This recipe delivers all the nostalgic flavors of a backyard bonfire—toasted marshmallows, melty chocolate, and honey-sweet graham crackers—in a single serving that is ready in under five minutes. By combining a rich cocoa base with "molten" pockets of chocolate and gooey marshmallows, you create a decadent, personal-sized lava cake that requires zero oven time and minimal cleanup.
Prep Time3 minutes
Cook Time1 minute
Total Time4 minutes
Servings: 1

Ingredients

  • 1/4 cup All-Purpose Flour
  • 3 tbsp Granulated Sugar
  • 1 tbsp Unsweetened Cocoa Powder
  • 1/4 tsp Baking Powder preferably aluminum-free
  • 1 dash Salt
  • 1/4 cup Milk
  • 2 tbsp Neutral Oil Vegetable or Canola
  • 1 splash Vanilla Extract
  • 3 tbsp Mini Marshmallows divided
  • 3 tbsp Chocolate Chips or Chocolate Bar pieces divided
  • 1 Graham Cracker divided and crushed
  • Optional: Hot Fudge Sauce Whipped Cream, or Vanilla Ice Cream

Instructions

  • Prep the Mug: Choose a microwave-safe mug that holds at least 8 ounces. A shorter, wider mug is ideal for even cooking.
  • Mix Dry Ingredients: Add the flour, sugar, baking powder, cocoa, and salt directly into the mug. Whisk with a small fork until well combined and no lumps remain.
  • Add Wet Ingredients: Pour in the milk, oil, and vanilla. Stir vigorously until the batter is smooth and you have scraped the bottom corners of the mug for dry flour.
  • The S'mores Mix-In: Stir in 2 tablespoons of the chocolate chips, 2 tablespoons of the marshmallows, and half of the crushed graham cracker.
  • First Microwave Burst: Microwave on high for 40 seconds. The cake should be risen and mostly set but still look slightly moist on top.
  • The Topping: Sprinkle the remaining 1 tablespoon of marshmallows, the rest of the chocolate, and the remaining graham cracker crumbs over the top of the warm cake.
  • Final Melt: Microwave for an additional 10 seconds to get the marshmallows puffy and the chocolate soft.
  • Rest and Serve: Let the cake sit for 1 minute to finish setting. Drizzle with hot fudge sauce and top with a scoop of ice cream if desired. Serve warm!

Notes

  • Avoid the Rubbery Cake: The most common mistake is cooking for too long. If it looks "almost" done, it's done!
  • Mug Size: Always ensure there is at least an inch of space at the top of the mug before cooking to prevent overflows.
  • Make it Vegan: You can easily use almond milk, coconut oil, and vegan chocolate/marshmallows for a delicious plant-based dessert.
  • Clean the Mug: For a cleaner presentation, wipe the inside rim of the mug with a paper towel after mixing but before microwaving.