01 - Preheat oven to 350°F. Lightly grease two 4-inch ramekins or mini cake pans with butter or cooking spray.
02 - In a small bowl, whisk together flour, cocoa powder, baking powder, salt, and granulated sugar until well blended.
03 - In a separate bowl, whisk egg, milk, melted butter, and vanilla extract until smooth and fully incorporated.
04 - Pour wet ingredients into dry ingredients. Stir gently until just combined, being careful not to overmix.
05 - Fold in chocolate chips if using, distributing evenly throughout the batter.
06 - Divide batter evenly between the two prepared ramekins, smoothing tops with a spatula.
07 - Bake for 16-18 minutes, or until a toothpick inserted into center comes out with a few moist crumbs attached.
08 - Let cakes cool in ramekins for 5 minutes before unmolding. Dust with powdered sugar, top with berries or whipped cream if desired.