Lunch Lady Brownies

Bahan-bahan (18 porsi)

• 1 cup butter (melted)
• ½ cup cocoa
• 1 cup light brown sugar
• 1 cup white sugar
• 4 eggs
• 1 tablespoons vanilla extract
• 2 cups all-purpose flour*
• 1⅓ cup brown rice flour
• ½ cup tapioca starch
• ⅓ cup potato starch
• ¼ cup butter (softened)
• 3 cups powdered sugar
• ¼ cup cocoa
• ¼ teaspoon kosher salt
• 5 tablespoons milk