Rainbow chips, mini M&M's, sprinkles, or other candy
Instructions
Heat oven to 350ºF. Line 8x8-inch baking pan with foil and spray with cooking spray. Set aside until ready to use.
In a large bowl, melt butter. Whisk in sugar, brown sugar, and cocoa powder. Then add in eggs, egg yolk, and corn syrup. Whisk until well combined. Add in flour, cornstarch, and salt, and whisk until combined.
Pour batter in prepared pan. Bake 25 minutes and let cool completely in pan.
Meanwhile, for frosting, place whipping cream in a small bowl and microwave for 1 minute. Add in chocolate chips. Let stand for 3 minutes before stirring until smooth. Pour frosting over cooled brownies and smooth evenly. Sprinkle brownies with raindbow chips. Refrigerate for 1 to 2 hours, or until frosting is set, before cutting and serving.