In a microwave-safe mug, add 4 tablespoons of gluten-free all-purpose flour, 2 tablespoons of unsweetened cocoa powder, 3 tablespoons of granulated sugar, 1/8 teaspoon of baking powder, and a pinch of salt. Whisk these dry ingredients together with a fork until well blended.

Pour in 3 tablespoons of milk, 2 tablespoons of neutral oil (or melted butter), and 1/4 teaspoon of vanilla extract. Stir vigorously until the batter is completely smooth.

Gently fold in 2 tablespoons of chocolate chips into the batter, leaving some aside to sprinkle on top later.

Place the mug in the microwave and cook on high for 60 to 75 seconds until the cake rises beautifully.

Carefully remove the mug from the microwave (it will be hot!) and let it rest for about 1 minute before serving warm.