One Bowl Brownies are my go-to when I need to make a dessert quick for a crowd. It's easy to make and filled with chocolatey goodness!
Preheat oven to 350° degrees and place rack in center of oven. Line a 9x13-inch baking dish with parchment paper.
Place the melted butter and cocoa powder in a large bowl. Whisk until smooth.
Add the sugar. Mix until blended well, then add eggs and vanilla. Mix until smooth.
Using a large spoon or spatula, fold in flour, just until flour disappears.
Spread the batter into the prepared baking pan and spread out evenly.
Bake 25 minutes or until a toothpick inserted in the center comes out with a few moist crumbs attached. Do not over bake. Remove from oven.
While the brownies are baking, make the frosting.
Beat together all the frosting ingredients in a bowl until smooth. After the brownies have cooled for 30 minutes, pour frosting over warm brownies and spread gently. Let cool completely before cutting and serving.