Ingredients

  • 1 cup all-purpose flour
  • 14 cup unsweetened cocoa powder
  • 2 teaspoons baking powder
  • 2/3 cup sugar
  • 12 teaspoon kosher salt
  • 2 large eggs
  • 12 cup canola oil
  • 2 tablespoons sour cream
  • 2 teaspoons vanilla extract
  • 3 pints coffee ice cream, slightly softened
  • 1 cup semisweet chocolate chips
  • 1/4 cup unsalted butter
  • 1/4 cup heavy cream
  • 2 tablespoons light corn syrup
  • 1 cup confectioners sugar, sifted
  • 1 teaspoon pure vanilla extract
  • 12 cup toffee bits
  • 1/2 cup chopped toasted almonds

Method

  • Preheat the oven to 350 degrees F. Butter a 9-by-13-inch baking dish, line it with parchment so it overhangs two sides, and butter the parchment.
  • To make the cake, sift the flour, cocoa, and baking powder into a bowl.
  • Whisk in the sugar and salt.
  • In another bowl, whisk together34 cup warm water, the egg, oil, and vanilla until blended.
  • Pour the wet ingredients into the dry ingredients and stir just until blended.
  • The batter will be very thick.
  • Spread the batter into the prepared dish in an even layer.
  • Bake until a toothpick inserted into the center of the cake comes out clean, about 20 minutes.
  • Let cool for 10 minutes in the dish on a wire rack, then remove from the dish and let cool completely.
  • Remove the parchment and return the cake to the dish.
  • Put the ice cream in a bowl and stir with a large metal spoon to soften the ice cream until spreadable (make sure it doesnt get overly soft and soupy).
  • Spread the ice cream over the top of the cake into a thick, even layer.
  • Cover with plastic wrap and freeze until firm, about 2 hours.
  • Meanwhile, make the ganache.
  • In the top of a double boiler set over barely simmering water, but not touching the water, stir together the chocolate chips, butter, cream,and corn syrup.
  • Heat, stirring often, just until the chocolate is melted.
  • Add the sifted confectioners sugar and vanilla and stir well until smooth.
  • Let cool slightly until cool but still spreadable (if the ganache cools too much, gently warm it until spreadable but not hot).
  • Quickly spread the ganache over the ice cream in an even layer.
  • Sprinkle with the toffee bits and almonds.
  • Freeze the cake until firm, about 4 hours.
  • Cut into squares and serve.