Preheat oven to 350°F (177°C). Butter or grease a 9" x 9" baking pan with cooking spray.
Melt butter in a large microwave-safe bowl. Stir chocolate chips until melted. Let cool slightly.
Add the red wine, vanilla and brown sugar and whisk together. Add the eggs one at a time, whisking to combine after each addition. Stir in the flour, cocoa powder, vanilla and salt until just incorporated. Do not over-mix.
Scrape the batter into the prepared baking pan. Bake for 20 to 25 minutes, until a toothpick inserted comes out clean. Let cool completely. Once cooled, dust with powdered sugar.