Root Beer Float Cake

INGREDIENTS

• :
• 2 cups root beer (do not use diet root beer)
• 1 cup dark unsweetened cocoa powder
• ½ cup (4 ounces) unsalted butter, cut into 1-inch pieces
• 1¼ cups granulated sugar
• ½ cup dark brown sugar
• 2 cups all-purpose flour
• 1¼ teaspoons baking soda
• 1 teaspoon salt
• 2 eggs
• 2 ounces dark chocolate, melted and cooled slightly
• ½ cup (4 ounces) unsalted butter, softened
• ¼ cup root beer
• 2/3 cup dark unsweetened cocoa powder
• 2½ cups powdered sugar