In the bowl of an electric stand mixer, add the melted butter and cocoa powder. Using the paddle attachment, blend until smooth.
Add the flour and sugar. Beat together then add eggs and vanilla. Mix just until combined. Don’t over mix. (Batter will be thick)
Pour batter into prepared baking dish and spread out evenly. Bake 25 to 30 minutes or until the toothpick inserted in center comes out clean. Remove brownies from oven and let stand 15 minutes before frosting. You want the brownies still warm when you frost them!
FOR CHOCOLATE FROSTING: Beat together all the frosting ingredients until smooth. Pour and spread over warm brownies. Let cool completely before cutting and serving.
Enjoy!
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