Preheat the oven to 350-degrees. Line a 9x9 pan with a piece of parchment paper so that the ends fold over the sides of the pan. Spray the parchment paper with cooking spray.

Melt the chocolate and butter in a double boiler and stir until smooth. Remove from the heat and beat in the sugar, vanilla and salt. Let the mixture rest while you sift the flour. Beat the eggs into the chocolate mixture, then stir in the flour. Stir in the toffee,chocolate chunks and nuts. Pour the batter out into the prepared pan.

Bake for 25-30 minutes until a tester comes out clean.