Toffee Crunch Brownies

4 squares (1 oz ea.) unsweetened baking chocolate
1/2 cup butter
4 eggs
1 cup sugar
2 teaspoons vanilla
3/4 cup flour
1/4 teaspoon salt
6 ounces toffee candy bars, -- chopped

In the top of a double boiler, melt chocolate and butter over warm water. Remove from heat. In a large mixing bowl, beat eggs and sugar until light and fluffy. Blend into> chocolate mixture. Blend in vanilla, flour and salt. Stir in toffee candy. Spoon mixture into a greased 9" square baking pan. Bake at 325 for 45 minutes. Cool in pan before cutting into squares.