Step 1: Place the brownie ingredients into a food processor bowl.
Step 2: Transfer mixture to prepared pan. Press down into the square pan in an even layer using a piece of parchment.
Step 3: In a small bowl, combine chocolate ganache frosting ingredients. Whisk until smooth.
Step 4: Spread frosting over the brownie layer. Place baking pan in the freezer for at least 3 hours to set.