Combine Dry Ingredients: In a microwave-safe mug, whisk 4 tablespoons flour, 2 tablespoons sugar, 1 tablespoon cocoa powder, ¼ teaspoon baking powder, and a pinch of salt until smooth and uniform.

Add Wet Ingredients: Pour in 3 tablespoons milk, 2 tablespoons vegetable oil, and ¼ teaspoon vanilla extract; stir gently until the batter is creamy and free of lumps.

Customize Batter: For extra indulgence, fold in 1 tablespoon chocolate chips or chopped nuts; this adds gooey pockets of chocolate and delightful crunch in every bite.

Microwave Baking: Cook on high power (1000W) for 75 seconds; the cake should rise slightly and remain moist and fudgy, with a few cracks on top for that homemade charm.

Cool Briefly: Let the mug cake sit for 1–2 minutes; this short rest helps the cake set and prevents burnt tongues when you dive into that warm, chocolatey goodness.

Serve and Enjoy: Top with a scoop of vanilla ice cream, a dusting of powdered sugar, or fresh berries; indulge in your instant homemade dessert straight from the mug.