Preheat your oven to 350°F (175°C) and grease an 8-inch square baking dish.

In a medium bowl, mix melted butter and cocoa powder until smooth. Add granulated sugar, then mix in eggs one at a time followed by vanilla extract.

In another bowl, whisk together flour and salt, then fold into the chocolate mixture until just combined.

Pour the batter into the prepared dish and bake for about 25 minutes or until a toothpick comes out with moist crumbs attached.

For the meringue, whip egg whites until foamy; gradually add powdered sugar while beating until stiff peaks form.

Spread meringue over baked brownies and return to the oven for an additional 10 minutes or until lightly golden.