Kue Coklat Batangan Fudgy

Bahan-bahan (24 porsi)

• 8 ounces semisweet chocolate chips
• 1 1/2 sticks salted butter, about 170 grams, softened
• 1 cup sugar
• 1/4 cup all purpose flour
• 6 eggs, yolks and whites separated
• 8 ounces semisweet chocolate chips (for the frosting)
• 1 cup heavy cream (for the frosting)