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Preheat oven to 350° F. Line an 8x8 baking pan with parchment paper and spray nonstick cooking spray. Set aside.
In a makeshift double boiler, melt semisweet chocolate and butter, stirring often.1 Once melted, whisk in cocoa powder and set aside to cool slightly.
In a large bowl, whisk together eggs, sugar and vanilla until well combined and light in color, about 60 seconds. Whisk in the warm chocolate mixture until well incorporated, about 30 seconds. Finally, whisk in the flour and salt just until combined.
Using a silicone spatula or rubber spoon, gently stir in 1/2 cup of the mini marshmallow bits. Pour mixture into prepared pan and spread evenly with spatula. Sprinkle additional 2 tablespoons marshmallows on top.
Bake at 350° F for 30 minutes or until the top is shiny and the center is still dense. Brownies will continue to bake once removed from oven.
Remove from oven and allow brownies to cool for 2 hours. Once cooled, dust with cocoa if desired and cut into squares. Enjoy!