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In a microwave-safe mug (approximately 12-14 ounce capacity), combine the boxed brownie mix, milk, and vegetable oil. Stir well with a small whisk or fork until the mixture is smooth and no dry spots remain.
Stir in 1 tablespoon of the semisweet chocolate chips into the batter. Then, place the additional 1 teaspoon of chocolate chips directly into the center of the batter; this will create the molten lava effect.
Microwave the mug cake on high for 60 to 90 seconds. Cooking time may vary depending on your microwave's wattage. The edges should appear set, but the center should still be slightly gooey. Be careful not to overcook, or you will lose the lava center.
Carefully remove the mug from the microwave. Immediately sprinkle the mini marshmallows and the remaining 1 teaspoon of chocolate chips over the top of the hot cake. Return the mug to the microwave for an additional 10-15 seconds, just until the marshmallows begin to puff and melt, and the chocolate chips are glossy.
If desired, dust the top of the warm mug cake with 1/2 teaspoon of confectioners' sugar. Serve immediately and enjoy your decadent treat!

In a microwave-safe mug (approximately 12-14 ounce capacity), combine the boxed brownie mix, milk, and vegetable oil. Stir well with a small whisk or fork until the mixture is smooth and no dry spots remain.
Stir in 1 tablespoon of the semisweet chocolate chips into the batter. Then, place the additional 1 teaspoon of chocolate chips directly into the center of the batter; this will create the molten lava effect.
Microwave the mug cake on high for 60 to 90 seconds. Cooking time may vary depending on your microwave's wattage. The edges should appear set, but the center should still be slightly gooey. Be careful not to overcook, or you will lose the lava center.
Carefully remove the mug from the microwave. Immediately sprinkle the mini marshmallows and the remaining 1 teaspoon of chocolate chips over the top of the hot cake. Return the mug to the microwave for an additional 10-15 seconds, just until the marshmallows begin to puff and melt, and the chocolate chips are glossy.
If desired, dust the top of the warm mug cake with 1/2 teaspoon of confectioners' sugar. Serve immediately and enjoy your decadent treat!