In a large bowl, whisk together melted butter, sugar and 2 teaspoons vanilla. I couldn't find my vanilla essence, so didn't add it. Whisk in egg and blend well

In another bowl, stir together flour, cocoa, baking powder and salt. Gradually stir flour mixture into egg mixture until well-combined. Transfer to the baking bowl. Luckily I had a small MW bowl, which worked out perfectly well.

Microwave for 5 mins. Of course, after 3 mins, check with a knife or toothpick inserted in centre to see if it. It was all done in 5 mins. The knife inserted should come out clean though some crumbs are attached to it. Sometimes, brownies may sink in the centre too. Let it rest for a min, then invert over the wire rack and cool completely!